Thornton, Colorado, USA
UpdatedWed, 15-Aug-2018 8:40am MDT 


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Thornton’s Wednesday to offer seasonal temps, slim chance for storms

Wednesday, August 15th, 2018 5:00am MDT

A nice looking day ahead for us with temperatures being a bit warmer than yesterday. We do have another chance for storms today but right now, it doesn’t appear very likely we will see any activity.

The day starts under mostly clear skies. By mid-morning most clouds will have dissipated only to have them return in the afternoon although they won’t be all that intrusive.

Highs today will be right close to the average high for the date of 88 degrees. There is just a slight chance for storms from about 3:00pm to 6:00pm but we aren’t expecting much, if any, activity.

Tonight, skies will be partly clear with lows around 60 degrees.

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Slightly cooler temps Tuesday, a bit of a chance for thunderstorms

Tuesday, August 14th, 2018 4:55am MDT

Minor changes to Thornton’s weather today as low level moisture increases. We will see things cool a few degrees, clouds increase some and just a slight chance for a thunderstorm in the afternoon and evening.

The day starts with mostly sunny skies and those will be with us until this afternoon when cloud cover will increase some.

The morning will be dry then, after about 2:00pm, we may see a thunderstorm move off the higher terrain to the adjacent plains. The chances don’t look great but they do exist. We should see similar levels of smoke as in recent days from the wildfires so there won’t be a break from it.

High temperatures today will top out in the mid-80s.

Tonight, any thunderstorm activity should end by 10:00pm and then we will be left with partly clear skies. Overnight lows will be around 60 degrees.

You can keep an eye out for any storms here.

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Seasonal temperatures, sunny skies start Thornton’s workweek

Monday, August 13th, 2018 5:41am MDT

Monday is going to bring weather conditions quite like what we just saw this past weekend. Temps should be a couple of degrees cooler but otherwise look for more calm, dry conditions.

The day starts under sunny skies and those will be with us until this afternoon when just a few clouds show up. Highs today will top out in the upper 80s, right near the average high of 88 degrees for the date.

Tonight, skies remain mostly clear with lows around 60 degrees.

Looking ahead at the rest of your workweek, temperatures are going to remain largely unchanged, maybe a hair cooler. We do see a chance for some storms on a few of the days. More in the extended forecast here.

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August 12 to August 18: This week in Denver weather history

Monday, August 13th, 2018 4:28am MDT
This week in Denver weather history

August 12 to August 18: This week in Denver weather history

Denver’s weather calms considerably in August as compared to many other months but the history books show plenty of notable events in our past. Lightning, flooding rain and even a tornado highlight this week in Denver weather history.


In 1875…clouds of grasshoppers were seen flying through the air on the prevailing winds during each day.


In 1876…the temperature climbed to a high of 100 degrees in downtown Denver.

In 1941…excessive thunderstorm rainfall flooded streets and delayed traffic for a few hours in some sections of the city. The basements of a considerable number of homes and commercial buildings were flooded. The total value of the damage was unknown. Only 0.94 inch of thunderstorm rainfall was recorded downtown.

In 1969…a man and a 9-year old boy were injured…when lightning struck a tree near where they were standing. Both were revived after treatment…but the boy later died of respiratory failure due to electrical shock.

In 1984…heavy thunderstorm rains drenched southern metro Denver. Rural roads in Douglas County received minor washouts. Hail…as large as 3/4 inch in diameter…was reported in southeast Aurora with one inch diameter hail reported near Parker. Rainfall totaled 1.00 inch at Stapleton International Airport.
12-13 in 1975…heavy rains caused flash flooding along the foothills from Denver north. Thunderstorm rainfall totaled 1.56 inches at Stapleton International Airport.

In 2004…a brief cool spell resulted in two daily temperature records. The low temperature of 49 degrees was a record minimum for the 12th…as was the low temperature of 48 degrees on the 13th.


In 1959…thunderstorm winds gusted to 53 mph at Stapleton Airport.

In 1983…thunderstorms dumped torrential rain in Northglenn… Thornton…and Broomfield. Northglenn was drenched with 1.72 inches in 30 minutes. Street flooding was widespread. Hail…as large as 3/4 inch in diameter…was reported 7 miles northeast of Boulder along with heavy rain which caused some street flooding.

In 2000…lightning sparked 3 small grass fires near Golden. The fires were quickly contained. Hail as large as 3/4 inch in diameter fell in Castle Rock.


In 1960…a bolt of lightning struck a man in Henderson… Causing serious burns.

In 1962…the temperature climbed to a high of 100 degrees at Stapleton Airport.

In 1968…a young man on a golf course in Denver was injured when lightning struck a tree under which he was standing. Lightning caused minor damage to a house in Denver. Heavy thunderstorm rain caused local street flooding. One inch diameter hail fell at Jefferson County Airport near Broomfield.

In 1973…winds as high as 85 mph damaged 20 aircraft at the Arapahoe County airport…now centennial airport.

In 1977…three tornadoes were sighted in Bennett. A man suffered a broken leg when hit by a flying board. He was outside his camper home…which was destroyed. All windows were broken in a near-by farmhouse where some shingles were ripped off and a 2 car garage was knocked down. Several vehicles were damaged and a cat…some rabbits…and chickens were killed. A broken oar from a boat was driven into the side of a house. A mobile home was overturned. One old barn was destroyed. Half a dozen homes and several agricultural buildings were damaged just west of State Highway 79.

In 1978…high winds produced much blowing dust…causing many traffic accidents in the Denver-Boulder area. Winds gusts of 70 to 101 mph were recorded. Northwest winds gusted to 44 mph at Stapleton International Airport.

In 1980…lightning hit two power poles in Littleton…causing 400 dollars in damage. Rainfall of 1.23 inches in a short time caused minor flooding…which included damage to a ground floor apartment and partially submerging a few vehicles in water. Thunderstorm rainfall totaled 0.98 inch at Stapleton International Airport.

In 1983…2.10 inches of rain drenched Golden in an hour with similar amounts in Lakewood and Boulder. Over ten thousand dollars worth of plants were washed away at a nursery in Lakewood.

In 1997…twelve motorists were injured in a multi-car accident when strong microburst winds estimated to 50 mph blew blinding dust across I-70 near Bennett.

In 1998…lightning struck a hydro-electric plant in Nederland… Causing a power outage. Residents in the foothills west of Boulder…including Nederland…Ward…Eldora…Jamestown… And Gold Hill…were without power for about an hour.

In 2006…heavy thunderstorm rainfall near Deckers washed away some the banks along State Highway 67 between Deckers and Westcreek. Several driveways on both sides of the highway were also damaged.


In 1899…a thunderstorm produced southwest sustained winds to 43 mph with gusts to 46 mph.

In 1972…a pilot reported a funnel cloud briefly touching the ground in open fields…17 miles east-northeast of Stapleton International Airport.

In 1980…thunderstorm winds gusted to 55 mph in Boulder.

In 1982…brief heavy rain and winds estimated as high as 70 mph occurred in the conifer-Evergreen area. No damage was reported.

In 1990…lightning triggered a small attic fire in a house near Sedalia…20 miles south of Denver. A furious lightning storm caused widespread power outages across southern sections of metro Denver. One lightning bolt knocked out an electrical substation…causing a 90-minute blackout in southeast Denver affecting nearly 10 thousand homes and businesses.

In 2007…severe thunderstorms produced large hail…up to 2 inches in diameter…near larkspur. Extensive damage to vehicles in the area was reported.

In Parker…lightning struck a residence. The ensuing fire damaged the attic and top floor; causing $100000 in property damage.

In 2008…at least three homes were hit by lightning during the early morning hours in Arapahoe County. Lightning also struck two homes in Castle Rock…damaging the roofs.

In 2013…a dry microburst uprooted 30 to 40 large trees across a 12-block area of the Park Hill neighborhood in east central Denver. Several trees were snapped near the base along with numerous branches…8 to 10 inches in diameter. Power poles and lines were also downed with resulted in outages which affected seven hundred residents. One of the downed trees crushed a car`s hood… narrowly missing the driver. At Denver International Airport…a peak wind gust of 22 mph was observed from the southwest.

» Click here to read the rest of August 12 to August 18: This week in Denver weather history

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August 2018 top shots: Monthly photo slideshow

Sunday, August 12th, 2018 4:46pm MDT
Black and white of a scene in Thornton. (LE Worley)

Black and white of a scene in Thornton. (LE Worley)

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 12, 2018

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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Sunny, calm and seasonal weather conditions for Thornton’s weekend

Friday, August 10th, 2018 4:48am MDT

Well, this is one of the simplest, most boring weekend forecasts we have issued in a long time. High pressure is going to dominate the three day period keeping any drama at bay and allowing pleasant, seasonal conditions.

Temperatures from Friday through Sunday should top out right near the average high for the dates of 89 degrees.

Overnight lows will be around 60 degrees.

Really, there isn’t much else we can say about it other than to hope you enjoy it!

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Lots of sun, seasonal temps, calm conditions for Thornton’s Thursday

Thursday, August 9th, 2018 4:59am MDT

With high pressure dominating the region holding any drama and moisture away, we will enjoy a good looking day today. Temps will be right near normal and there will be plenty of those blue, Colorado skies above.

We start out with sunny skies and will see them last through the early afternoon. After that, a few clouds may arrive but nothing too intrusive. Overall conditions will be calm with no thunderstorms expected in our area. Highs will top out in the upper 80s.

Tonight, skies will be partly clear with overnight lows around 60 degrees.

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Wednesday to offer warm temperatures, just a slight chance for storms

Wednesday, August 8th, 2018 5:02am MDT

A fine looking summer day ahead for Thornton. Temperatures will be close to normal and the afternoon and evening offer only a bit of a chance for storms.

We start out under clear skies and will enjoy lots of sun for much of the day. The mid-afternoon will bring a few clouds but nothing too intrusive. Highs today will top in the upper 80s, close to the average high of 89 degrees.

Thunderstorm activity should be quite isolated today with activity largely to our west and south. We may see something pop up after 4:00pm but chances don’t appear good.

Tonight, lows will dip to around the 60 degree mark.

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Comfortable temperatures, slight chance for storms for Thornton’s Tuesday

Tuesday, August 7th, 2018 5:00am MDT

A pretty nice looking day ahead for us. Temperatures will be below normal and quite pleasant while the evening offers up a typical chance for thunderstorms.

We start out the day under sunny skies then will see a few clouds later this morning with a further increase in coverage in the afternoon. Temperatures will top out in the mid-80s, a bit below normal, making for a nice one.

Late afternoon brings a slight chance for thunderstorms with the best opportunity coming after 6:00pm. Right now it appears most activity will be to our south but we can’t rule out some isolated storms our way.

Tonight, any storms will settle down after dark and we will be left with clearing skies and lows in the upper 50s.

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Thornton’s August 2018 preview: Temperatures moderate, severe weather decreases

Monday, August 6th, 2018 6:46pm MDT

As summer vacations wind down and families prepare to send their kids back to school in August, Colorado weather also starts to settle down. The chances for severe weather decrease markedly during August and by the end of the month daytime temperatures are dropping quite a bit as well.

Find out more about what lies ahead with Thornton’s August weather here.

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