Thornton, Colorado, USA
UpdatedSun, 15-Sep-2019 6:45pm MDT 


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Toasty temperatures continue in Thornton Thursday, clouds increase

Thursday, August 29th, 2019 5:20am MDT

Once again we are going to see high temperature readings well above normal today. A cold front will be arriving later today and while that will bring clouds, it won’t arrive in time to cool things down.

Sunny skies start us off then we will see clouds steadily increase through the day. By mid to late afternoon look for mostly to partly sunny skies. No thunderstorms are expected.

High temperatures today will reach to the low to mid-90s.

Late afternoon / early evening will see the cold front arrive. That will lead to partly cloudy skies and overnight lows in the upper 50s.

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Wednesday brings the return of the heat, conditions remain dry

Wednesday, August 28th, 2019 5:18am MDT

Hopefully you enjoyed the last two days of cooler weather as the mercury will bounce back to above normal readings today. With the heat will be lots of sun and dry conditions.

Mostly sunny skies will be with us initially then those few clouds should dissipate giving us sunny skies for most of the day. Winds will be light and no storms are expected. Highs today will top out in the low 90s, about five degrees above normal.

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

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Lots of sun, comfortable temperatures for Thornton’s Tuesday

Tuesday, August 27th, 2019 4:58am MDT

A second cold front will be pushing through today leading to another nice day with mercury readings below normal.

Sunny to mostly sunny skies will be above throughout the day. Winds will be just a bit breezy from late morning into the first part of the afternoon as the cold front arrives. Highs today will be right near the 80 degree mark.

Tonight, skies remain clear with lows in the mid-50s.

Enjoy the cooler weather as we’ll be jumping back to the 90s tomorrow and Thursday.

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Thornton’s workweek starts with a break from the heat

Monday, August 26th, 2019 5:08am MDT

The promised cold front has worked its way through and that is going to offer up a pleasant change in our weather. Cooler temperatures will be with us for a couple of days before a return of the heat mid-week.

This morning we will have a few clouds but most of those will soon move out leaving us with mostly sunny skies. The winds we saw overnight will ease but remain just a bit breezy. High temperatures today will be in the low 80s.

Tonight, mostly clear skies will be above with lows in the mid-50s.

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August 25 to August 31: This Week in Denver Weather History

Sunday, August 25th, 2019 5:10am MDT
This week in Denver weather history

August 25 to August 31: This Week in Denver Weather History

Overall our look back at this week in Denver weather history is shorter than most but it is not short on interesting weather events.

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 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.

» Click here to read the rest of August 25 to August 31: This Week in Denver Weather History

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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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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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