Thornton, Colorado, USA
UpdatedFri, 23-Aug-2019 10:35am MDT 


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Thornton’s weekend starts out seasonal, then sees a return of the heat

Friday, August 23rd, 2019 5:06am MDT

We will be seeing a bit of a weather roller coaster this weekend and into at least the first part of the week. Friday will be pretty typical of what we expect to see this year but then the heat returns for Saturday and Sunday. However, cooler weather looks to be on the way Monday.

For today, partly sunny skies will be above throughout with highs in the mid to upper 80s. The afternoon and evening will a bit of a chance for thunderstorms. Tonight, partly clear skies will be above with overnight lows in the mid-50s.

Saturday dries out and warms up. Mostly sunny skies will be above and at this time we do not expect any storms. Highs will be in the low 90s. Saturday night into Sunday morning, mostly clear skies will be above with lows around 60 degrees.

Sunday warms up even further with highs in the mid-90s under sunny skies.

Beyond that, we are still expecting a shot of cooler air from the north to arrive Monday. This should bring temperatures to at least around normal, perhaps even cooler than that. Have a great weekend!

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Thornton’s Thursday warms up a bit, offers another chance for thunderstorms

Thursday, August 22nd, 2019 5:13am MDT

Today offers weather a good bit like what we experienced yesterday. Temps will be a few degrees warmer and we again will see some scattered thunderstorm activity.

Mostly sunny skies start us off and will be with us till late morning when clouds will then increase.

By then, thunderstorms will be developing in the high country and foothills. Some of these will move off to lower elevations. Our best chance for activity will come from about 3:00pm to 6:00pm. Some of these storms will have the potential for hail, strong wind and heavy rain.

Highs today will be in the upper 80s.

Tonight, storm activity will end by midnight leaving us with partly to mostly cloudy skies. Overnight low temps will be around the 60 degree mark.

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August 2019 top shots: Monthly photo slideshow

Thursday, August 22nd, 2019 3:18am MDT
A golden landscape on the Great Plains. (Jessica Fey)

A golden landscape on the Great Plains. (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 22, 2019

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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The heat finally takes a break Wednesday but thunderstorms will threaten

Wednesday, August 21st, 2019 5:28am MDT

Cooler air from the thunderstorms east of us yesterday will help to get our mercury readings close to normal today. Moisture is increasing and that is going to lead to a good chance for afternoon and evening thunderstorms as well.

Partly clear skies start us off this morning and then we should see some clearing lasting until the late afternoon. High temperatures today will be in the mid-80s.

Thunderstorms will get started after about 2:00pm with the best opportunity for us coming from 5:00pm until 11:00pm. Some storms will have the potential to turn with heavy rain, large hail and strong winds being the biggest threat.

Tonight, storm activity should be wrapped up by midnight and skies will clear. Overnight lows will be in the upper 50s.

Keep an eye on the sky and on our Severe Weather Briefing Page as storms begin to roll.

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Temperatures remain toasty for Tuesday, just a slight chance for a thunderstorm

Tuesday, August 20th, 2019 5:00am MDT

Look for weather conditions in Thornton to be much like they were yesterday. The mercury will again climb well above normal but we do have just a bit of a chance for a PM thunderstorm.

Mostly sunny skies start us off and will be with us until mid to late afternoon. After that, we expect a bit of an increase in cloud cover.

Late afternoon introduces just a bit of a chance for a thunderstorm with the best opportunity coming in the evening. Most activity though will likely be to our north.

Highs today will top out in the mid to upper 90s.

Tonight, a few lingering thunderstorms may last into the early morning hours tomorrow. Overnight lows will be around 60 degrees.

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Denver ties record high temperature for August 19

Monday, August 19th, 2019 6:04pm MDT

Record High Temperatures

As expected, temperatures across the Front Range climbed toward record-setting territory today and the Mile High City tied the 21 year old record high.

As measured at Denver International Airport, Denver’s high temperature today hit 99 degrees. That tied the old record high for the date set in 1998.

Here in Thornton, we matched that 99 degree reading at 1:49pm.

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Thornton’s workweek starts off with potentially record-setting heat

Monday, August 19th, 2019 5:08am MDT

High pressure has settled in and will be keeping things pretty stable today and allow temperatures to climb. With a good dose of sun, temperatures will push toward record-setting highs.

Sunny skies start us off early this morning and then we will have just a few clouds for the balance of the day but nothing too intrusive.

With little moisture and a stable atmosphere, we do not expect any thunderstorms. Highs today will be well above normal and will come close to the record high for the date of 97 degrees set in 1986.

Tonight, partly cloudy skies will be above with overnight low temperatures in the mid-60s.

What lies ahead for the rest of the week? See here.

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August 18 to August 24: This Week in Denver Weather History

Sunday, August 18th, 2019 4:32pm MDT
This week in Denver weather history

August 18 to August 24: This Week in Denver Weather History

Our look back at this week in Denver weather history highlights the extreme weather that can be visited upon us this time of year. Many of the events showcase severe weather more associated with spring than the latter half of summer.

From the National Weather Service:


In 1979…heavy thunderstorm rains on each of 4 consecutive days dumped a total of 2.62 inches of rain on Stapleton International Airport. The heaviest rain…1.05 inches… On the 19th was accompanied by 1/4 inch diameter hail.


In 1965…heavy rain in areas south and east of Denver caused some flooding in Littleton and Englewood. Clear creek was running near bankfull…and heavy rain in southwest Denver flooded intersections.

In 1966…a brief very heavy thunderstorm dumped 0.61 inch of rain in just 5 minutes at Stapleton International Airport. Total rainfall from the storm…0.64 inch…fell in just 10 minutes. Half inch diameter hail also fell at Stapleton International Airport. The public sighted funnel clouds 10 to 15 miles south of the airport.

In 1967…hail struck in a strip along the eastern foothills and caused minor damage in Boulder. Hail accumulated to a depth of 4 to 6 inches in Jefferson County just southwest of Denver.

In 1983…one inch to hen egg size hail was reported in Broomfield with golf ball size hail at Northglenn.

In 1990…dime size hail and thunderstorm wind gusts to 50 mph were reported by storm spotters just east of Aurora near the intersection of Mississippi Avenue and Gun Club Road. The hail and strong winds damaged a number of windows in the area.

In 1991…very heavy rain from slow moving thunderstorms dumped up to 3 inches of rain in 20 minutes in the vicinity of Idaho Springs and Central City. Flooding in Idaho Springs forced the closure of the Virginia Gulch Road…which runs from Idaho Springs to Central City. Dirt roads above Central City were damaged or destroyed with the mud being swept onto streets in town. High water in Clear Creek…up to 3 feet above flood stage…washed out a bridge in Idaho Springs. Rock and mud slides forced the closure of I-70 about 1 mile east of Idaho Springs.

In 1997…dry microbursts produced two peak wind gusts to an estimated 60 mph east of Buckley Field.

In 2000…hail as large as 3/4 inch in diameter was measured 5 miles west of Sedalia.

In 2003…a severe thunderstorm produced hail as large as 2.75 inches in diameter at Highlands Ranch. Hail to 3/4 inch was reported in Aurora near Cherry Creek and in Arapahoe County 9 miles southeast of Aurora.

In 2004…heavy thunderstorm rainfall caused flash flooding across central and southern metro Denver. A rain gage at City Park recorded 4.37 inches of rainfall from the deluge. Several roads in and around the city had to be closed due to floodwaters…stranding many vehicles. The Denver fire department conducted at least 15 water rescues. One driver nearly drowned when he made a wrong turn into a retaining pond. Four men who witnessed the accident were able to save the man before his car was completely submerged. Widespread street flooding was reported in the Denver Stapleton area where rainfall totaled 3.81 inches. Standing water over 6 inches deep was reported near I-70 and Quebec…I-225 south of I-70…and I-25 near 6th Avenue. Flood waters reached 8 feet deep in some low lying areas as sewers became clogged and the storm runoff pipes were unable to handle the heavy flow of water. Heavy rainfall caused additional flash flooding south of Denver. Several street intersections in Centennial and southern Aurora became impassable due to high water. Two feet of water covered portions of the roadway near Park Meadows Mall. One person had to be rescued near the intersection of Arapahoe Road and Liverpool. Floodwaters forced the closure of Stonegate Parkway near Jordan Road and Lincoln Avenue. Flooding was also reported on Meridian Blvd. near I-25. Rainfall was 1.62 inches at Denver International Airport.


In 1875…nearly 0.75 inch of rainfall in the city overnight… Possibly assisted by heavier rainfall upstream…produced a decided and rapid rise in Cherry Creek…which washed out some bridges. Other small creeks and streams were filled to overflowing.


In 1983…heavy rain fell across the northern metro Denver suburbs with 1.50 to 1.80 inches of rain in Broomfield… Arvada…and Thornton.

In 1989…lightning killed a 31-year-old man and injured his 10 year old nephew when it hit a tree they were walking under in the foothills about 5 miles west of Boulder. The boy received mouth to mouth resuscitation on the scene and recovered after being hospitalized overnight. Three other people were knocked to the ground by the bolt…but were uninjured.

In 1990…3/4 inch diameter hail was reported in Wheat Ridge. A thunderstorm over west Denver dumped an inch of rain in 20 minutes…causing minor street flooding. One inch diameter hail was reported over east Denver. Ping pong to golf ball size hail was reported 14 miles northeast of Denver at the intersection of 122nd Ave. and Brighton Blvd. The hail stones knocked out windows and did an unspecified amount of damage to the roof of a house. Close by…heavy thunderstorm rains caused gullies…irrigation ditches…and small streams to overflow their banks near the intersection of 120th Avenue and Riverdale Road. Flood waters 1 to 2 feet deep covered the river bottom land along the South Platte River. However…no structures were threatened by the flood waters.

In 1999…heavy rain…up to 5 inches in two hours…caused east tollgate creek to jump its banks. The bike path adjacent to the creek was underwater at several locations. Several underpasses were also flooded…halting traffic. In addition…an unfinished playground at a local elementary school was completely flooded. Lightning struck a vehicle at East Evans Avenue and Tower Road. The woman inside the vehicle was not injured.


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 1980…winds to 55 to 60 mph were recorded in south Boulder.

In 1982…strong thunderstorm winds blasted the Jefferson County Airport near Broomfield…causing an estimated 3 million dollars in damage. At least 5 hangars and 15 airplanes were damaged…many seriously; one hangar was completely destroyed. Torrential rains accompanied the winds. Heavy rains also dumped on Boulder where 1.65 inches fell in just 15 minutes…causing street flooding. Wind gusts to 72 mph were recorded in Boulder. Over half an inch of rain fell in just 5 minutes in Littleton where two homes were struck by lightning. Lightning also struck a house in Arvada where over an inch of rain sent Ralston Creek over its banks. Strong winds accompanied the storms.

In 1984…slow moving thunderstorms dumped 1.25 inches of rain in Evergreen…causing street flooding. A half inch of rain fell in just 18 minutes in southeast Denver. Littleton and Boulder were also drenched with about an inch of rain. Rainfall totaled 0.92 inch at Stapleton International Airport.

In 2001…severe thunderstorms produced damaging winds and large hail across metro Denver. Hail as large 1 inch in diameter fell in Aurora near Cherry Creek. Strong thunderstorm winds gusting as high as 58 mph blew the roof from a building between Thornton and Denver and toppled several trees in Denver. One tree landed on a mail truck. Other thunderstorm winds were clocked to 60 mph near Parker… 62 mph in Broomfield…and 61 mph at Denver International Airport.

In 2006…a tornado (f0) touched down near Bennett…but caused no reported damage.

In 2013…severe thunderstorms pounded the southern Denver suburbs and other parts of the Front Range. In Jefferson County…water rescues were reported for some people in stranded cars. In the Ken Caryl area…large hail from one inch to 1 3/4 inches in diameter was reported. On West Chatfield Avenue in Jefferson County…hail runoff gathered six inches deep in spots and “hail plows” were sent out to clear some streets. Hail up to one inch in diameter was also reported near Castle Rock.

» Click here to read the rest of August 18 to August 24: This Week in Denver Weather History

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Thornton’s weekend starts out seasonal, will end up hot

Friday, August 16th, 2019 5:38am MDT

Mother Nature’s furnace is getting ready to kick on. While we will enjoy temps not far from normal and a chance for storms today, temps for the balance of the weekend will be increasing.

Friday will bring mostly sunny skies throughout the day. Highs will top out right around the 90 degree mark. We do stand a chance for PM thunderstorms, mainly after 3:00pm. Some storms in eastern Colorado may turn severe but right now it appears the worst should stay to our east. Overnight tonight, skies will be mostly clear with lows in the upper 50s.

Saturday will be a calm day but with increasing temperatures. Highs will be in the mid-90s under mostly sunny skies. Saturday night into Sunday morning, mostly clear skies will be above, lows will again be in the upper 50s.

Sunday brings the heat. Sunny skies will be above with highs in the mid to upper 90s.

Have a great weekend.

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Toasty temperatures for Thornton’s Thursday, some breezy winds

Thursday, August 15th, 2019 5:08am MDT

We will avoid any thunderstorm activity today and enjoy lots of sun. However, we will see some breezy winds and temperatures will climb five degrees or so above normal.

Sunny skies start us off this morning and will be with us until the afternoon when a few clouds will arrive. Winds will pick up speed by mid-afternoon and be a bit breezy. High temperatures will reach the mid-90s.

Tonight, partly cloudy skies will be above with lows around the 60 degree mark.

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