Thornton, Colorado, USA
UpdatedSun, 05-Dec-2021 2:00am MST 


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Monday starts the workweek with more of the same hot, smoky conditions

Monday, August 9th, 2021 4:59am MST

If you’re looking for a change from the recent weather conditions, you won’t find it in this forecast. Temperatures are going to remain well above normal and the smoke will continue to impact the sky and air quality.

The day starts off with sunny, but hazy skies. Some cloud cover will be seen later in the day. Smoke will be a big part of the day with it increasing and peaking about mid-afternoon. Temperatures today will top out in the mid-90s.

Tonight, smoke will continue with partly clear skies. Overnight lows will dip to the low 60s.

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Thornton’s weekend weather to offer up two hot days with one cooler day in the middle

Friday, August 6th, 2021 4:57am MST

The three-day period will be bookended with hot days. Between, Saturday will see things cool a bit with mercury readings closer to normal.

For Friday, we start out clear and then cloud cover will slowly be increasing. We will continue to experience hazy, smoky skies. Highs today will be heading toward the mid-90s. The afternoon brings a chance for a shower although most at this time look to be high-based and likely won’t amount to much if anything. Tonight, we will have some breezy winds in the evening but otherwise calm conditions. Lows will be around 60 degrees under mostly clear skies as a weak trough pushes in.

Saturday will be the coolest day of the weekend. Sunny to mostly sunny skies with smoke can be expected. Highs will be near the 90 degree mark. Saturday night into Sunday morning, lows will be in the upper 50s under mostly clear skies.

Sunday sees the heat return. Conditions will be calm and dry as we head toward a high of 95 degrees. Sunny skies will be with us the majority of the day. Have a great weekend!

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August 1 to August 7: This week in Denver weather history

Tuesday, August 3rd, 2021 3:37pm MST

This Week in Denver Weather History

August isn’t normally associated with severe weather but our look back at the history books show it certainly can and does happen.  We see many occurrences of dangerous lightning and of particular note is the flood events – a byproduct of the monsoon season the first of August brings.


In 1987…a streak of 16 consecutive days of 90 degrees ranked 4th on the list of hot streaks.  The record of 24 consecutive days was established in the summer of 2008.


In 1888…heavy rain in the mountains and foothills caused flooding on clear creek in Golden.  The high waters also washed away portions of the railroad tracks in the canyon between Idaho Springs and Golden.

In 1901…the temperature reached a high of 100 degrees in the city.

In 1902…the high temperature climbed to 100 degrees in downtown Denver.

In 1914…a thunderstorm produced 1.00 inch of rainfall in just 21 minutes and north winds sustained at 43 mph with gusts to 50 mph.  Rainfall totaled 1.17 inches.

In 1938…the temperature climbed to a high of 100 degrees in downtown Denver…which is the record maximum for the date.  The temperature was also recorded on this date in previous years.

In 1976…flight operations at Stapleton International Airport were suspended for 90 minutes when the airport tower radar was knocked out and water reached a foot deep on some taxi ramps after 1.50 inches of rain fell in one hour.  Heavy rain also caused minor flooding in east Denver and Aurora where lightning damaged the roof of a home and injured the owner.  One young man was swept down a flooded ditch…but was rescued by firemen.  A number of rafts were floated in flooded streets.  Thunderstorm rainfall totaled 1.71 inches at Stapleton International Airport.

In 1978…a tornado damaged a house and broke a power pole 5 miles northwest of Parker.  A microburst wind gust to 52 mph briefly reduced visibility to 1 mile in blowing dust at Stapleton International Airport.

In 1985…heavy thunderstorms roared through the southern and western sections of metro Denver…producing large hail and heavy rain.  Lightning hit a recreational vehicle trailer causing it to burn.  There was a lot of street flooding over western suburbs where rainfall totaled over 2 inches in some areas.  One inch diameter hail was reported in Littleton and near Evergreen.  Hail piled 4 to 6 inches deep at Tinytown in the foothills southwest of Denver.

In 1990…a small rope-like tornado was spotted in open country 15 miles southeast of centennial airport. No damage was reported from the twister.

In 1992…pilots reported a funnel cloud near the construction site of the new Denver International Airport.  A few minutes later…a tornado was reported near Bennett.  The tornado remained on the ground for about 18 minutes and was visible from the national weather service office at Stapleton International Airport.  Thunderstorm wind gusts to 70 mph were reported near Bennett and Watkins with a wind gust to 60 mph at Brighton.  Two men were injured when struck by lightning.  A young man sustained serious injuries when struck by lightning while jet skiing on Cheery Creek Reservoir.  A man received only minor injuries when struck by lightning while golfing in Westminster.

In 1994…heavy thunderstorm rains in the foothills west of Denver caused the closure of the Virginia Canyon Road north of Idaho Springs by rocks and debris.

In 2001…a 34 year old man on the South Platte River bike path in Denver received minor injuries when lightning struck a nearby tree.  Lightning…coupled with strong thunderstorm winds…knocked out electrical power to about 10 thousand homes and businesses in Golden.

In 2006…strong thunderstorms hit southern metro Denver. A severe thunderstorm wind gust estimated to 71 mph knocked down a tree in Aurora near Cherry Creek. Lightning sparked a fire in a home near Lone Tree and struck a transformer at an RTD light rail station at Interstate 25 and Yosemite street.  Heavy thunderstorm rainfall forced the closure of Arapahoe road between Holly and Quebec streets due to high water.  Flooding was also reported near park meadows mall and greenwood village.  Heavy rainfall also caused flooding in Highlands Ranch…Lone Tree…and Parker.  Water up to 6 inches deep was reportedly running over the roads.


In 1878…the high temperature reached 100 degrees in downtown Denver.

In 1911…an apparent dry microburst produced sustained west winds to 42 mph.

In 1972…one workman was killed and another injured when a strong gust of wind destroyed a partially completed apartment building in south Denver.  Hail to 1 3/4 inch diameter fell in Golden.

In 1973…hail to 3/4 inch diameter was reported in Boulder.

In 1986…a major outbreak of severe thunderstorms occurred along the Front Range.  Thunderstorms developed explosively.  Some places were hit by large hail twice. Two inch diameter hail broke car windows on I-25 west of Brighton…and up to 1 1/4 inch hail broke windows in Thornton.  Baseball size hail damaged several planes near Watkins.  Funnel clouds were sighted around Aurora.  Hail over 1/2 inch in diameter covered the ground 3 to 4 inches deep at Hudson northeast of Denver.  Most of the hail fell north of metro Denver…but 3/4 inch diameter hail was measured at Stapleton International Airport.  Total damage from the hail storms this day was estimated at over 10 million dollars.

In 1991…late afternoon thunderstorms produced heavy rain across metro Denver.  Two feet of water covered parts of I-25 in southeast Denver…while one foot of water covered parts of U.S. Highway 285 in Englewood.  Thunderstorm rainfall totaled 0.50 inch at Stapleton International Airport.

In 2001…severe thunderstorms producing heavy rain and hail… Either washed out or damaged several County roads in the Watkins and Bennett areas.  A small tornado (f0) touched down near Bennett…but did no damage.  Hail as large as 1 3/4 inches in diameter fell near Watkins.  One inch diameter hail was measured near Hudson and Keenesburg.

In 2008…strong winds blew several trees down in Denver… Damaging homes and downing power lines.  A peak wind gust of 67 mph occurred at Centennial airport…with gusts to 60 mph estimated in Denver.  A peak wind gust of 37 mph was measured at Denver International Airport.  An elderly man was killed when a wind damaged tree broke free and crushed him while he attempted to remove it.  The downed power lines caused outages to about 500 Xcel energy customers.

» Click here to read the rest of August 1 to August 7: This week in Denver weather history

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Out of the office

Monday, August 2nd, 2021 6:00am MST

Out of the Office and in the Mountains

We will be out of the office for a few days while we disconnect and recharge. Be sure to visit the website regularly for the latest forecasts, radar, current conditions and more. See you soon!

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Thornton’s weekend starts out hot but relief will arrive Saturday and Sunday

Friday, July 30th, 2021 5:36am MST

One more hot day for us on Friday. Then, a series of fronts and increased monsoonal moisture will offer up cooler temperatures and a good chance for precipitation.

For today, sunny skies start us off but cloud cover will be slowly increasing throughout the day. Highs will top out in the low to mid-90s. A few isolated thunderstorms may develop in the afternoon. Tonight, the evening and overnight hours bring better chances for storms and showers. Lows tonight will be in the low 60s under mostly cloudy skies.

Saturday we will feel the effects of the cold front in earnest. Mostly cloudy skies will be above and highs will top out around 80 degrees. Some light showers will be possible throughout the day with the afternoon bringing increased coverage with some thunderstorms. Saturday night into Sunday morning, mostly cloudy skies will be above and some showers and thunderstorms will be possible. Overnight lows will be in the low 60s.

Sunday things begin to dry out a bit. Some light showers will be possible but they won’t be numerous or strong. Highs will top out around 80 degrees under partly sunny skies. Have a great weekend and enjoy the change in the weather!

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The heat continues Thursday in Thornton, conditions remain dry

Thursday, July 29th, 2021 4:53am MST

No notable change in our weather for today. While it won’t be particularly noticeable, we will be a few degrees cooler than yesterday.

Sunny and mostly sunny skies will be above throughout the daytime hours. Winds will be light, conditions calm and dry. High temperatures will be climbing to the mid-90s.

Tonight, lows will be in the mid-60s under partly cloudy skies.

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July 2021 top shots: Monthly photo slideshow

Wednesday, July 28th, 2021 6:12pm MST
July 2,2021 - Absolutely gorgeous skies over Margaret Carpenter Park. (LE Worley)

July 2,2021 – Absolutely gorgeous skies over Margaret Carpenter Park. (LE Worley)

Colorado offers outdoor opportunities unlike any other state and while the summer heat settles in, photos of the amazing scenes across our state provide a view into why we love it here so much.

The weather this time of year has a pretty standard pattern of quickly warming temperatures followed by afternoon thunderstorms that can cool things down.  These storms sometimes provide a good bit of ‘excitement’ and are a prime photo subject.

  • Slideshow updated July 25, 2021

Recreationalists head outdoors and take advantage of urban, suburban and rural opportunities.  As they do, our abundant wildlife that is found just about anywhere comes into focus.

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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Denver sets new record high temperature for July 28

Wednesday, July 28th, 2021 5:11pm MST

Record High Temperature

Another high temperature record in the books for summer 2021.

As measured at Denver International Airport, the Mile High City’s temperature topped out at 100 degrees today. This easily bests the record high for the date of 98 degrees set 145 years ago in 1876.

Here in Thornton, we matched the 100 degree mark. This was our fifth 100+ degree day of the year in Thornton, more than any other year in the past 15 since Thornton Weather came online.

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Potentially record-setting heat on tap for Thornton’s Wednesday

Wednesday, July 28th, 2021 4:53am MST

The mercury just keeps on climbing. Today looks to be the hottest day of the week, one that may break a record.

Sunny skies with some haze will be above throughout the daytime hours. Conditions will be calm and dry. Temperatures will be hitting the upper 90s. Denver’s record high for the date is 98 degrees, set 145 years ago in 1876, and that mark may very well fall.

Tonight, skies will be mostly clear with lows in the mid-60s.

Looking forward, we will have a couple more days with hot temps then this weekend should see things cool down.

Keep an eye on the temperatures with our live weather gauges here.

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Tuesday to offer up sunny skies, hot temperatures

Tuesday, July 27th, 2021 4:53am MST

Not much change in our forecast for today versus what we have seen in recent days. We will have clearer skies and temps will again be above normal.

Sunny skies start us off and will continue throughout the day. Overall conditions will be calm and dry. High temperatures today will again reach the mid-90s, a good bit above the average high for the date of 90 degrees.

Tonight, lows will be in the mid-60s under mostly clear skies.

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