Thornton, Colorado, USA
UpdatedTue, 18-Dec-2018 9:10pm MST 


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Unsettled conditions, cool temps for Thornton’s Tuesday

Tuesday, August 21st, 2018 5:04am MST

An approaching storm system is going to mix things up a bit for us today. Temperatures will be a bit cooler than yesterday and we will see a decent chance for showers, particularly this evening.

The day starts with mostly cloudy skies then we will see a few breaks in the coverage for the mid-day before clouds increase in the mid to late afternoon. Smoke will still be lingering although it should be a bit less than yesterday’s soup.

High temperatures today will be in the low to mid-70s, a good bit below the average high of 87 degrees for the date.

A few sprinkles of rain may occur in the morning and early afternoon but if they do, they aren’t expected to amount to much. After about 3:00pm chances for showers and coverage increase with the best opportunity coming between about 6:00pm and midnight.

Tonight, showers may linger into the early morning tomorrow. Lows will be in the mid-50s.

You can keep an eye out for those showers with our interactive radar here.

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Denver ties record low temperature for August 20

Monday, August 20th, 2018 8:05am MST

Record Cold TemperaturesIf you were thinking you were feeling fall in the air the last day or two you had good reason.  Temperatures this morning almost felt chilly and Denver tied the record low temperature for the date.

At 6:25am this morning, the mercury at Denver International Airport where the Mile High City’s official records are taken dipped to 46 degrees. This tied the record low temperature for August 20 last set in 1939.

Here in Thornton we were just a touch warmer with a low of 47 degrees.  That was our second chilliest temperature since May 21.

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Thornton’s workweek starts out with cool temps, hazy skies from smoke

Monday, August 20th, 2018 4:56am MST

Overall your Monday looks to be pretty nice with pleasant, cooler than normal, temperatures and skies relatively clear of skies. However, we do also expect to see a good bit of smoke from fires to our west.

The day starts with mostly clear skies then later this morning clouds should clear off leaving sunny skies until the late afternoon. As mentioned, smoke is expected to create hazy conditions for much of the day. Temperatures today will top out in the upper 80s.

Tonight, skies will be partly clear with lows to the mid-50s.

Looking ahead, the rest of the week looks to be pretty nice. Tuesday will be similarly cool and introduce a chance for storms. After that, we begin to warm up to near normal levels for the latter half of the week. Details in the extended forecast here.

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Thornton’s weekend starts out with more of the same, will end cooler

Friday, August 17th, 2018 6:03am MST

The three day period offers up a bit of variety. Friday will be a day much like the last few and while Saturday cools slightly, Sunday is when we see a decent change in temperatures.

For today, moisture aloft is increasing and that will lead to more cloud cover. Highs will top out in the upper 80s as they have in recent days. The afternoon brings a chance for thunderstorms although most activity will be to our south.

Saturday starts out with some clearer skies and temperatures will reach the mid-80s. A front will move through in the afternoon and serve to stir things up, increasing the chance for storms. Some of these will have the potential to turn severe.

Sunday will see cooler temperatures courtesy of that same front with highs in the mid to upper 70s.

Have a great weekend!

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Seasonal temperatures, relatively calm conditions for Thursday

Thursday, August 16th, 2018 4:52am MST

Thornton will see weather today almost identical to yesterday. Temps will be right near normal for this time of year and there is only a slight chance for storms.

We start out with clear skies then see some mid-level moisture bring a few clouds for much of the day but nothing too intrusive. Temperatures will top out at around 88 degrees.

There is just the slightest chance for an evening thunderstorm although most likely any activity will be south of us.

Tonight, skies will be mostly clear with lows in the upper 50s.

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Thornton PD posts their entry for the lip sync challenge

Wednesday, August 15th, 2018 1:03pm MST

The silence from the Thornton PD has been deafening. As other Denver metro area police departments posted their lip sync challenge entry, we heard nothing from the local men and women in blue. That changed today.

Set to the song “Danger Zone” by Kenny Loggins and made famous in the movie Top Gun, the Thornton Police Department brings it all from cars to motorcycles to yes, even planes.

All in all, we have to say the video is worth the wait and probably the best we have seen from any local agency.  Of course we are residents of Thornton and Navy veterans so we might be biased.  😉

If you can’t see the video below, click here to view it at its source.

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

Wednesday, August 15th, 2018 8:28am MST
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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Thornton’s Wednesday to offer seasonal temps, slim chance for storms

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

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 MST

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 MST

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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