Thornton, Colorado, USA
UpdatedSun, 07-Mar-2021 1:45pm MST 


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Thornton finally breaks out of the heat with cooler temps, chances for precipitation for the weekend

Friday, August 28th, 2020 5:06am MST

Finally! It has been long overdue but we get out of the hot weather pattern of recent weeks starting today. Making it even better, we stand a decent chance to receive much-needed rain.

For Friday, mostly sunny skies will be the rule in the morning and then this afternoon cloud cover will increase. Highs today will be below normal and in the low to mid-80s. The afternoon brings some scattered thunderstorm activity with our best opportunity coming from 3:00pm to 8:00pm. Tonight, partly clear skies will be above and lows dip to the upper 50s.

Saturday continues the cooler temperatures with highs again in the low to mid-80s under partly sunny skies. Moisture will be increasing and that will give us a decent chance to see some PM showers. Saturday night into Sunday morning, any shower activity will end by midnight and partly cloudy skies will be above. Overnight lows will be in the upper 50s.

We close out the weekend on Sunday with a bit of a rebound in the temperatures. Mostly sunny skies will be above and highs will be in the upper 80s. There will be just a slight chance for a PM thunderstorm but activity at this time looks to be quite isolated. Enjoy the break from the heat

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Thornton gets one more hot day before relief from the heat arrives

Thursday, August 27th, 2020 4:59am MST

Following yesterday’s much-needed shower, today sees the heat return and less of a chance for storms. However, a cold front will be moving through tonight serving to cool things down for Friday and the weekend.

Sunny but hazy skies start us off today then we will see a few clouds in the late morning and afternoon as usual. Highs today will once again be well above normal, topping out around 97 degrees. Mid to late afternoon through the evening bring just a slight chance for storms but, at this time, those are looking to be pretty widely scattered.

Tonight, any storm activity will end by midnight and skies will be mostly clear. Overnight lows will be in the low 60s.

Looking ahead, a cold front moves through late tonight and with it cooler temperatures and better chances for precipitation will be seen Friday and for the weekend. Then, a second front on Monday should cool us down even further. Get a sneak peek at your weekend forecast here.

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August 2020 top shots: Monthly photo slideshow

Thursday, August 27th, 2020 3:30am MST
Sunflowers at sunset near DIA. (Jessica Fey)

Sunflowers at sunset near DIA. (Jessica Fey)

As the calendar turns to August, the summertime heat begins to fade and that makes it easier to get out and enjoy all of the outdoor activities Colorado has to offer.  From a walk in a park to afternoon thunderstorms to an abundance of wildlife, photo opportunities abound as is seen in our slideshow.

Our monsoon season typically arrives about now and that means better chances for moisture.  However with limited instability, the intensity of storms are more sedate.  That doesn’t mean however that the weather is any less photographic.

  • Slideshow updated August 27, 2020

By the end of the month some of our seasonal feathered friends will be looking to leave the state giving our last chance to see them till spring.  Larger mammals are gearing up for the rut (mating season) and that can make for some intense scenes.

Showcasing images captured by ThorntonWeather.com readers as well as some of our own, our monthly slideshow covers the entire gamut of weather and nature related imagery. Sunsets, sunrises, wildlife and of course every type of weather condition are vividly depicted.

To learn more about how to send your photo to us for inclusion in the slideshow, see below the slideshow.

What is missing in the slideshow above?  Your photo!

Our monthly photo slideshow is going to feature images that we have taken but more importantly images that you have captured.  The photos can be of anything even remotely weather-related.

Landscapes, current conditions, wildlife, pets, kids.  Whimsical, newsy, artsy.  Taken at the zoo, some other area attraction, a local park, a national park or your backyard.  You name it, we want to see and share it!

Images can be taken in Thornton, Denver or anywhere across the extraordinary Centennial State.  We’ll even take some from out of state if we can tie it to Colorado somehow.

We’ll keep the criteria very open to interpretation with just about any image eligible to be shown in our slideshows.

What do you win for having your image in our slideshow?  We are just a ‘mom and pop’ outfit and make no money from our site so we really don’t have the means to provide prizes.  However you will have our undying gratitude and the satisfaction that your images are shared on the most popular website in Thornton.

To share you images with us and get them included in the slideshow just email them to us or share them with ThorntonWeather.com on any of the various social media outlets.  Links are provided below.

So come on, get those camera’s rolling!

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Another warm one in Thornton on Wednesday, a bit better chance for a storm

Wednesday, August 26th, 2020 5:27am MST

We continue to see hope on the horizon for cooler temperatures and precipitation. However, before we get there, we have a couple more days with above-normal mercury readings and only slight chances for storms.

Today starts off with sunny but hazy / smoky skies and those will be with us through the morning. The afternoon will bring a typical increase in clouds. Highs today will once again top out in the mid-90s.

The afternoon brings a slight chance for storms with slight better opportunities in the evening from about 6:00pm to 8:00pm. Gusty winds and, if we are lucky, some rain will be possible.

Tonight, any storms will be done by 11:00pm and skies will begin to clear. Overnight lows will dip to the low to mid-60s.

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Hot and dry conditions remain Tuesday, some hope for relief by the end of the week

Tuesday, August 25th, 2020 5:15am MST

For today, Thornton will see little change in the weather with smoke continuing to be seen and temps above normal. We are optimistic however that by the end of the week we will see the high pressure ridge break down and with it, cooler temperatures.

Today starts out with sunny skies but plenty of haze from the wildfire smoke. A few clouds will move in later this morning and the afternoon will see mostly to partly sunny skies. High temperatures will again reach the mid to upper 90s, well above the average high for the date of 86 degrees.

The afternoon and evening bring just the slightest chance for a thunderstorm but gusty winds will be the most likely outcome of any storms that do form.

Mostly clear skies will be seen overnight and lows will dip to the mid-60s.

Looking ahead, we do see the ridge begin to ease and a cold front pushing in on Friday. That should help to usher in better (but not great) chances for precipitation and temperatures closer to normal for the weekend. A second front on Monday will have the potential to bring true relief with even cooler readings.

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Denver ties record high temperature for August 24

Monday, August 24th, 2020 4:49pm MST

Record High Temperature

Another hot day on the Colorado Front Range and Denver sees another record high temperature.

As measured at Denver International Airport, the Mile High City’s official high temperature hit 98 degrees. That ties the record high temperature for the date set in 2011. This is the sixth time this month that Denver has tied or broken a daily high temperature record.

Here in Thornton, we were just a hair cooler with a high of 97 degrees.

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Thornton’s workweek starts with the same hot, dry conditions of recent weeks

Monday, August 24th, 2020 5:02am MST

We pretty much could copy and paste a forecast from one of the days past as there is little change in the weather. Temperatures are going to continue to be well-above normal but, keep your fingers crossed, there may be relief toward the end of the week.

Today starts off with clear skies then we will see a few clouds later this morning. By this afternoon, partly sunny skies will be above. Highs today will once again push toward record-setting territory. The record high for the date for Denver is 98 degrees and we should come close to that, if not break it.

We see just a slightest chance for a thunderstorm in the evening. Tonight, skies will be mostly clear with overnight lows in the low to mid-60s.

Looking ahead, we see increased moisture which will lead to somewhat better chances for thunderstorms by mid-week. Medium range models then point to a cold front Friday that, if it pans out, would cool us to near normal for the weekend. See the extended forecast for more.

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Denver ties the record high temperature for August 23

Sunday, August 23rd, 2020 6:09pm MST

Record High Temperature

Another hot one in the Mile High City and another record set or tied for the month.

As measured at Denver International Airport, the city’s official high temperature today topped out at 98 degrees. This ties the record high for the date last set in 2011.

Today’s mark is the fifth time this month Denver has tied or broken a record high temperature.

Here in Thornton, we matched that mark with a high reading of 98 degrees as well.

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August 23 to August 29: This week in Denver weather history

Sunday, August 23rd, 2020 5:04am MST

This Week in Denver Weather History

Quite the interesting week in Denver weather history.  Swarms of grasshoppers are the most unusual item we see but there is plenty of standard severe weather including tornadoes, landspouts, hail, lightning and much more.

From the National Weather Service:


In 1875…grasshoppers appeared in great numbers at 10:00 am on the 19th.  Thousands landed on the ground.  The streets were literally covered with them.  Swarms of grasshoppers were seen on each day.  All gardens in the city were devastated…and in the countryside the grasshoppers were very destructive to ripened grain.  On the 30th the grasshoppers were so numerous as to almost darken the sun.


In 1987…some locations in metro Denver had a total 3-day rainfall of 2 to 4 inches.  Rainfall totaled 0.96 inch at Stapleton International Airport.


In 1900…northwest winds were sustained to 42 mph with gusts to 49 mph.

In 1921…a thunderstorm cloudburst produced 2.20 inches of rainfall in an hour over downtown Denver.  This is the greatest 1 hour rainfall on record at the official observing site in the city.  Precipitation totaled 2.93 inches…which is the greatest calendar day precipitation ever recorded in august.

In 1941…one man was killed by lightning about 2 miles from the official weather station in downtown Denver.

In 1962…a home near Boulder was destroyed by a lightning- caused fire.

In 1968…strong winds buffeted Boulder briefly during the early morning hours.  At the National Center for Atmospheric Research…winds averaged 55 mph with gusts to 85 mph.  Damage was minor.  Northwest winds gusted to 31 mph at Stapleton International Airport.

In 1977…lightning damaged at least 6 homes in Aurora.

In 2008…a landspout touched down near Westcreek in Douglas County.  One man was seriously injured when he tried to escaped several falling trees in his ATV.  One of the trees struck his back and broke two vertebra.  Another camper narrowly escaped injury.  Seconds after he back up his truck…a tree came down where it had been parked.


In 1880…a thunderstorm produced vivid lightning and heavy rainfall…which caused flooding over the eastern part of the city including the brick yards.  There was no rainfall recorded in downtown Denver.

In 1910…an apparent dry cold front caused a remarkable drop in temperature.  From 3:00 pm until midnight the temperature fell from a high of 93 degrees to a low of 40 degrees. Northeast winds were sustained to 44 mph during the late afternoon.

In 1946…heavy rain near Idledale caused flooding on Bear Creek at Morrison…which resulted in one death when a woman was swept from her stranded car and drowned.

In 1973…strong winds blew down a few power lines and hail up to 3/4 inch diameter fell in southeast Aurora.

In 1984…heavy rain hit the south Denver area.  Over an inch fell in less than an hour at both Castle Rock and Sedalia.

In 1992…heavy rains caused flash flooding across parts of metro Denver.  Rainfall amounts of 1 to 3 inches fell with the hardest hit areas being the southwest and central parts of metro Denver.  Bear Creek rose above bankfull near Idledale with flood waters moving into southwest metro Denver.  Mud and rock slides along Colorado highway 74 west of Morrison were reported.  The confluence of Cherry Creek and the South Platte River in downtown Denver also went out of its banks…flooding bike paths.  Rainfall totaled 1.98 inches at Stapleton International Airport where light to moderate rain fell most of the day.  Heavy rain and fog briefly reduced the surface visibility to 1 1/2 miles.  The temperature climbed to a high of only 58 degrees…which was a record low maximum for the date.

In 2002…hail to 7/8 inch in diameter was measured in southwest Denver.

In 2008…several landspout tornadoes developed along a boundary to the southeast of the Denver metropolitan area during the democratic national convention.  In northwest Elbert County… Minor damage was reported.  The damage consisted of downed power lines…broken windows and an out building.  Severe thunderstorms also produced very heavy rain and large hail… Up to one inch in diameter.  In southwest Douglas County… Heavy rain caused flash flooding near the town of Westcreek. A mudslide closed State Highway 67.  The road in the YMCA camp shady brook was also washed out and some bridges were damaged.


In 1910…the lowest temperature ever recorded in August…40 degrees…occurred on each of these days and on August 22… 1904.  The unusually cold weather for so early in the season brought sub-freezing minimum temperatures to much of the Colorado northeastern plains.


In 1951…a microburst produced a southwest wind gust to 50 mph at Stapleton Airport.  Only a trace of rain was observed.

In 1964…thunderstorm winds gusted to 59 mph and caused some blowing dust at Stapleton International Airport.

In 1994…lightning struck a power pole in Louisville and caused a two-hour power outage.

In 2008…an unoccupied home was struck by lightning in Aurora… Causing 75 thousand dollars in damage to the roof.


In 1944…one of the most destructive hailstorms in the city in a decade caused damage estimated at nearly one million dollars.  The storm occurred within a period of 10 to 30 minutes…between 2:00 pm and 3:00 pm.  The hail varied in size from very small to as large as 1 1/2 inches in diameter.  Hail covered the ground to a depth of 5 to 6 inches in some sections of the city.  Several people were cut by broken glass.  The hail and heavy rain flooded underpasses to a depth of 6 feet…and the occupants of stalled autos had to be rescued.  Sewers were unable to handle the sudden amount of water and water backed up and flooded a number of basements.  A few first floors of buildings were flooded.  The water department had a busy time replacing manhole covers that had been displaced by the water pressure.  Trees were stripped…one was severely broken…and telephone lines were downed.  Roofs…windows… Automobiles…awnings…and gardens were severely damaged. Flowers and gardens in some sections of the city were a total loss.  Greenhouses were extensively broken with an estimated 20 carloads of glass shattered.  Vegetable and truck crops in and around the city were severely shredded. The next day the American Red Cross was designated by the War Agency to grant any and all priorities needed to obtain materials and supplies to replace and repair the damage. In downtown Denver…the thunderstorm produced 0.95 inch of rain and heavy hail along with sustained northwest winds to 25 mph.

In 1961…strong winds blew in the walls of a warehouse under construction in Denver.  Two workmen suffered a fractured foot and body bruises.

In 2014…two men in central Denver were struck by lightning as they sat under a tree to avoid a heavy downpour. One of the men was unconscious and had no pulse when emergency responders arrived. He was immediately taken to Denver Health was listed in critical condition. The other victim suffered less severe injuries. He was treated at the scene and hospitalized…then released a few hours later.


In 1980…two heavy thunderstorms hit Arvada and Westminster… Dumping up to 1.50 inches of rain in less than an hour. At least two streets were washed out and a number of homes and cars were damaged when a creek flooded.  Three homes in Arvada sustained minor lightning damage.


In 1910…a thunderstorm produced south winds sustained to 40 mph.

In 1961…strong thunderstorm winds and heavy rain occurred at 79th and Federal Blvd. In Westminster.  The strong winds blew the roofs off lumber sheds onto parked cars.

In 1967…a young woman was killed by lightning while horseback riding in the suburbs just west of Denver.  Her horse died several hours after the incident.  A young man and another young woman were also knocked from their horses by the impact of the lightning and required hospitalization.

In 1991…heavy thunderstorm rainfall totaled 0.91 inch at Stapleton International Airport…where 1/4 inch diameter hail was measured.

In 1996…localized street flooding occurred in the Fort Lupton area when 2 to 3 inches of rain fell in 45 minutes. The roof of a community college began leaking…which caused damage to ceiling tiles.  The roof was under repair from hail damage which had occurred earlier in the summer.  A weak tornado (f0) was sighted near Fort Lupton.  No damage was reported.

In 1999…a slow moving thunderstorm dumped 5 inches of rain in 2 hours near Dacono.  A severe thunderstorm produced 3/4 inch diameter hail in Castle Rock.

In 2002…severe thunderstorms spread large hail over metro Denver.  Hail as large as 2 inches in diameter fell in Jefferson County 5 to 11 miles northwest of Golden.  Other large hail reports included:  1 1/2 inches near Golden and in Lakewood; 1 1/4 inches in Nederland; 1 inch hail near Elizabeth…Louviers…Rollinsville…and Blackhawk; 7/8 inch hail near Acequia in Douglas County.  A thunderstorm produced a trace of rain and a microburst wind gust to 52 mph at Denver International Airport.

In 2003…lightning struck a house and sparked a fire in Arvada.  Damage to the roof and ceiling was extensive.

In 2005…lightning struck an unoccupied home in Parker. The resulting fire damaged the roof…attic…and second floor bedroom.  Damage was estimated at 15 thousand dollars.


In 2004…a brief chilly spell resulted in three temperature records.  The high temperature of 55 degrees on the 27th was a record low maximum for the date.  The low temperature of 48 degrees on the 27th equaled the record minimum for the date.  The low temperature of 42 degrees on the 28th was a record minimum for the date.


In 1887…a dry thunderstorm produced north winds to 48 mph but only a trace of rainfall.

In 1968…one man was seriously injured by lightning while riding on a roller coaster at a Denver amusement park.  An airline employee was injured when lightning struck a jetliner he was servicing at Stapleton International Airport.  A lightning-caused fire did extensive damage to one house and minor damage to several others in the city of Denver.

In 1970…a microburst wind gust to 53 mph was recorded at Stapleton International Airport.

In 2002…a severe thunderstorm produced 3/4 inch diameter hail near Parker.

In 2005…lightning sparked a small fire near Jamestown.  The blaze was quickly contained and consumed less than an acre.


In 1876…after the passage of a gentle rain shower to the east during the late evening hours…the moon shone brightly and a remarkably bright lunar rainbow appeared.

In 1910…an apparent cold front produced sustained northeast winds to 40 mph.

In 1946…the high temperature warmed to only 55 degrees…the record low maximum for the month.

In 1989…a spectacular lightning display knocked out power to 300 blocks in southeast Denver.  One bolt started a fire in a lumber yard in the northeast part of the city…and the attic of a home in the same area was set ablaze by a lightning bolt.

In 1996…3/4 inch diameter hail was measured in Parker.

In 2000…lightning struck two homes in Thornton.  The extent of damage was unknown.

In 2002…two small tornadoes caused damage in southeast metro Denver.  The first tornado…associated with a multi-vortex storm…touched down briefly near E-470 and South Jordan Road.  Some fences were damaged…and a few trees were blown down.  A few of the homes also sustained minor roof damage. Damage from this storm totaled 100 thousand dollars.  The second tornado associated with the storm touched down in a subdivision that was under construction at Gartrell and Arapahoe roads.  Four large condominiums under construction were destroyed.  The most heavily damaged portions of the structures were still in the framing stages.  Adjacent sections where enclosed walls were in place were not destroyed.  A man suffered 4 broken ribs and several cuts and bruises when the trailer he sought shelter in was flipped three times and torn apart by the twister.  Damage from this storm totaled 6 million dollars. A severe thunderstorm produced 1 inch diameter hail near Evergreen.

In 2006…severe thunderstorms produced large hail in the foothills west of Denver.  Hail to 1 inch in diameter fell near Blackhawk.  Hail as large as 7/8 inch was measured near Idaho Springs…along with 3/4 inch hail near Nederland and Conifer.

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Thornton’s weekend to offer up lots of sun and lots of heat

Friday, August 21st, 2020 5:00am MST

No rest for the heat-weary in the short term. Temperatures will continue to be well above normal and potentially set records Saturday and Sunday.

For Friday, sunny skies start us off and will be with us throughout the day. There will be some periods of smoke. We will remain dry and overall conditions calm. Highs will reach into the mid-90s. Tonight, mostly clear skies will be above with lows in the low 60s.

Saturday sees temperatures climb and will potentially exceed the record high for the date of 97 degrees. Once again, conditions will be calm and dry. Overnight Saturday night into Sunday morning, lows will dip to the low 60s under mostly clear skies.

Sunday will bring a few clouds but no relief from the heat. Mostly sunny skies will be above and the mercury will top out close to the record high of 98 degrees for the date.

We do see indications that mid-week next week may bring some moisture our way but that is a good ways out and far from certain. Have a great weekend.

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