Thornton, Colorado, USA
UpdatedTue, 16-Oct-2018 11:20am MDT 


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Tuesday brings cooler temperatures, another chance for storms

Tuesday, June 19th, 2018 5:07am MDT

Following on yesterday’s hailstorm, cooler temperatures will arrive today. The afternoon brings a chance for another rain of storms, some possibly severe if conditions set up right.

We start out under cloudy skies and some light drizzle. By mid-morning some clearing will begin to be seen but still with a good bit of cloud coverage.

This afternoon thunderstorms may again roll, particularly after 2:00pm. If we get enough daytime heating to kick convection off, these once again could turn severe with strong winds and damaging hail.

Highs today will top out in the low to mid-70s.

Tonight, thunderstorm activity should be tapering off by 9:00pm, ending by midnight. Skies will be mostly cloudy with lows in the low to mid-50s.

If you have any pics of hail damage, please share them and we will get them added to our slideshow. Be sure to keep an eye on our Severe Weather Briefing Page for all the latest.

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Thornton’s workweek starts out with seasonal temps, good chance for storms

Monday, June 18th, 2018 5:10am MDT

Finally! Thornton was slow to see the rain yesterday but some did finally arrive overnight. Today, begins damp, will then see some clearing, then see a decent chance for storms.

Mostly cloudy skies will be above initially but soon after the clouds will begin to clear off. Mostly sunny skies can be expected for the mid-day period then an increase in coverage again in the afternoon as storms build. Temperatures will be topping out today right around the 80 degree mark.

As for those thunderstorms, after about 1:00pm scattered activity is expected to develop and last through the evening. Some of these storms will have the potential to turn severe with large hail, strong winds, and heavy rain so please do keep an eye out and be aware.

Tonight, some rain will be possible after midnight. Overnight lows will dip to the mid-50s.

We’re going to continue to enjoy temperatures close to or a bit below normal for the first half of the week. Then we expect to see some drying and warming for the latter part. Get more details in the extended weather forecast here.

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Thornton’s weekend weather starts hot, ends cooler and with a good chance for rain

Friday, June 15th, 2018 5:11am MDT

The three day period starts off with a continuation of the unseasonably warm weather of recent days. However, by the end of the weekend, we see much-needed relief in the form of cooler temps and rain.

For Friday, mostly sunny skies will be above with the afternoon bring an increase in cloud cover. Temperatures once again will climb, leading to a high in the low to mid-90s. A slight increase in moisture brings a bit better chance of thunderstorms in the mid to late afternoon. Tonight, skies will be mostly cloudy with lows dipping to the low 60s.

Saturday starts to bring about change as moisture from the remnants of Tropical Storm Bud arrive in Colorado late in the day. The day starts with some sun then will see an increase in cloud cover leading to mostly cloudy skies for the latter part of the day. Temperatures will top out in the mid-80s by noon then start to cool. We’ll see an increased chance for storms, particularly in the evening hours. Some rain and storms may continue overnight Saturday night. Look for lows Saturday night into Sunday morning around the 60 degree mark.

Sunday bring significant changes. Cloud cover will be pretty solid for the day and temperatures cool with highs in the mid to upper 70s expected. Some light showers may be seen earlier in the day but in the afternoon, chances increase significantly. We could see some good, soaking rain at that time, lasting into the evening.

Have a great weekend!

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Thornton’s Thursday to offer hottest temps of the year, some breezy winds

Thursday, June 14th, 2018 4:57am MDT

The heat kicks into high gear today with an increase of a few degrees over the already hot temps we saw yesterday. We also will see some breezy PM winds and just a slight chance for an evening storm.

We start out under mostly sunny skies with cloud cover increasing as we head toward noon. Partly sunny skies will be the rule for much of the day. Winds will be light this morning then pick up a bit and by mid-afternoon become breezy and out of the northeast.

As for temperatures, they won’t be inhibited much by the cloud cover. Look for highs to top out around 98 degrees.

This evening we stand just a slight chance for a thunderstorm but with little moisture to work with, we aren’t giving much of a chance.

Tonight, partly cloudy skies will be above, lows will drop to the lower 60s.

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June 10 to June 16: This week in Denver weather history

Wednesday, June 13th, 2018 1:57pm MDT
This week in Denver weather history

June 10 to June 16: This week in Denver weather history

We are entering the primetime of Colorado’s severe weather season. Our look back at Denver weather history for this week shows numerous damaging, dangerous and deadly weather events.

From the National Weather Service:


In 1864…high water from melting snow combined with heavy rains over the upper reaches of the South Platte River forced the river over its banks and caused flooding of low lying areas along the river in the city. The amount of rainfall in the mountains and in the city is unknown.


In 1943…a man was killed by lightning while using a surveying instrument at Buckley Field.

In 1969…hail stones 2 to 3 inches in diameter caused extensive damage to buildings and automobiles in an area from northeast of Boulder to Longmont. Two funnel clouds were reported near Castle Rock. A funnel cloud and 1 inch hail stones were reported 10 to 20 miles southeast of Stapleton International Airport. Hail stones to 1 3/4 inches fell 3 miles west of Littleton. Hail to 3/4 inch diameter fell over southeast Denver.

In 1988…thunderstorm winds clocked to 60 mph unroofed a porch and downed a fence at a home near Stapleton International Airport. A small tornado touched down briefly in northeast Aurora. Another small tornado touched down for 3 minutes in southeast Aurora. No damage was reported from either twister.

In 1989…a national weather service observer saw lightning strike 2 storage tanks at 40th and Havana…3/8 mile northeast of Stapleton International Airport. The strike temporarily knocked out some weather observing equipment at the national weather service.

In 1991…a tornado was sighted 2 miles south of Castle Rock. No damage was reported. The funnel cloud associated with the tornado was sighted for 5 minutes by National Weather Service observers at Stapleton International Airport.

In 1994…lightning struck a home in Denver…which started a fire in the attic and caused minor damage.

In 1997…lightning struck a security guard at the castle pines golf course near Castle Rock. He received only minor injuries.

In 1999…severe thunderstorms rolled off the foothills over metro Denver…producing large hail and damaging winds. Hail to 1 inch diameter fell near Evergreen with 1 3/4 inch hail measured west of Golden. Hail to 1 1/2 inches fell in Commerce City with one inch hail in Lakewood…wheat ridge… The city of Denver and at Denver International Airport where thunderstorm winds gusted to 58 mph. As the storms moved east…3/4 inch hail was reported in Aurora…and damaging thunderstorm winds developed between Bennett and Strasburg. Winds gusting as high as 69 mph blew half a metal roof from a shed in a Bennett lumberyard. A small barn was also leveled between Bennett and Strasburg. Winds also gusted to 58 mph near Manilla.

In 2000…a dry microburst produced a wind gust to 58 mph at Jefferson County Airport. Thunderstorm winds gusted to 55 mph at Denver International Airport.

In 2003…hail as large as 1 3/4 inches was measured at centennial airport and near Parker.

In 2005…hail to 7/8 inch in diameter was reported near Parker with 3/4 inch hail measured near Castle Rock.

In 2009…lightning struck an apartment complex…a veterinary hospital in Boulder and caused minor damage. Lightning also struck two oil tanks…one in Boulder and the other at Front Range airport north of Watkins. The oil tanks in both instances were set on fire and suffered extensive damage.

In 2010…a complex of severe thunderstorms hammered portions of eastern Arapahoe…eastern Douglas and western Elbert counties. The hail ranged from 1 inch to 3 inches in diameter. The largest hail was observed near Elizabeth. Areas in and around Aurora…Byers…Parker and Thornton were also impacted by large hail. One weak tornado touched down near prospect valley but did no damage. At Denver International Airport…a peak wind gust to 35 mph was observed from the northwest.


In 1882…heavy thunderstorm rains on the morning of the 10th caused a rapid rise in Dry Creek…which enters the South Platte River at Fairview in present day south Denver. This…combined with additional heavy rainfall on the 11th caused the South Platte River to overflow. Five people drowned and several houses were destroyed. Total losses in the city and suburbs was estimated at 75 thousand dollars. Total rainfall in central Denver was 2.21 inches over the 2 days.


In 1947…a trace of snow fell over downtown Denver. Low temperature of 34 degrees was a record minimum for the date.

In 1962…hail caused extensive crop damage near Hudson northeast of Denver.

In 1970…stratiform rainfall totaled 3.16 inches at Stapleton International Airport. This was the greatest amount of precipitation ever recorded on a calendar day in June. In addition…it was the greatest amount of precipitation ever measured during any 24-hour period in June. The high temperature climbed to only 51 degrees…which was a record low maximum for the date.

In 1973…large hail from 3/4 to 1 1/2 inches in diameter fell west of Boulder.

In 1977…golf ball size hail was reported just south of Arapahoe County airport…now centennial airport. Lightning struck a home in Lakewood.

In 1988…a 30-year-old man was seriously injured by lightning while mowing his lawn in Denver.

In 1992…lightning started two house fires in the southern Denver suburbs where 3/4 inch hail fell and a funnel cloud was sighted.

In 1999…severe thunderstorms formed over the palmer divide and moved across Douglas…Elbert…and Adams counties. Hail as large as 1 inch in diameter was reported in and near Castle Rock…Sedalia…Franktown…and Aurora. Hail as large as golfballs accumulated several inches deep and caused a large section of a corrugated metal roof of a greenhouse complex to collapse near Franktown. About a third of the roof covering the 30 thousand square foot building collapsed. Thirty-five workers were trapped in the debris…but only 3 were treated for minor injuries. Hail 1 to 2 feet deep blocked the roadways and slowed the arrival of emergency vehicles. Damage to the building was estimated to be around 3 million dollars.

In 2006…a man was struck and killed by lightning as he was returning to his car after leaving the mile high flea market near Henderson. Two others were knocked down…but not injured by the lightning strike. Severe thunderstorms produced large hail across the northern portion of metro Denver. Hail to 1 1/4 inches in diameter was measured in Arvada…with 1 inch diameter hail reported near Fort Lupton. Hail to 7/8 inch in diameter was recorded near Brighton…and hail…3/4 inch in diameter…fell near Keenesburg.

In 2009…large hail pummeled portions of Adams…Arapahoe… Elbert and Douglas counties. Hail up to 1 1/2 inches in diameter was measured near Parker.

In 2010…severe thunderstorms producing very large hail pummeled portions of Front Range foothills and urban corridor. The large hail ranged in size from 1 to 2 1/2 inches…caused extensive damage to home and vehicles. The hardest hit areas included: Brighton… Castle Rock…Greenland…Idledale…Mountain View and Thornton. The combination of heavy rain and hail destroyed 50 thousand acres of cropland in southeast weld County. Flash flooding forced the closure of State Highway 52…east of prospect valley. Several County roads were either flooded or completely washed out. At Denver International Airport…0.69 inches of rainfall was observed.

» Click here to read the rest of June 10 to June 16: This week in Denver weather history

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Hotter temperatures, slight chance for storms for Thornton’s Wednesday

Wednesday, June 13th, 2018 5:03am MDT

We enjoyed two days with slightly cooler mercury readings but today we once again expect to exceed the 90 degree mark. There will be a slight chance for afternoon and evening thunderstorms but most activity is expected east of us.

We start out the day under mostly sunny skies then will see some clearing in the morning followed by a more clouds in the afternoon and evening. Winds will be light, out of the west this morning, then the northeast in the afternoon.

Temperatures will be heading toward a high in the low 90s, about 10 degrees above normal for the date. After 3:00pm and into the evening we have a slight chance for some thunderstorm activity however, as we said above, most activity will likely not be in our area.

Tonight, partly clear skies will be above with lows dipping to around the 60 degree mark.

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Tuesday brings temps a bit warmer than normal, just a slight chance for storms

Tuesday, June 12th, 2018 5:15am MDT

A day much like we had yesterday in terms of temperatures. We do expect to see a few more clouds though and perhaps an evening thunderstorm.

We start out under sunny skies then by mid-morning expect to see a few clouds but mostly sunny skies will be with us the balance of the day. Early on we may also see some haze from wildfires in southwestern Wyoming.

Temperatures start out comfortable this morning then begin a climb toward a high in the mid-80s. Most thunderstorm activity will be to our east and southeast but we can’t rule out a small possibility of an isolated, gusty storm in the evening.

Overnight tonight, partly cloudy skies will be above with lows dipping to the mid to upper 50s.

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Thornton’s workweek starts off with lots of sun, cooler temperatures

Monday, June 11th, 2018 4:55am MDT

Finally, a little bit of a break from the heat of recent days. Temperatures will still be above normal but far closer to normal than they have been.

The day starts with sunny skies and with a lack of moisture to create clouds, things should remain clear through the day. Temperatures today will top out in the mid-80s, cooler but still above the average high for the date of 81 degrees.

Tonight, skies remain clear with lows dipping to the mid-40s.

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Denver ties record high temperature for June 9

Saturday, June 9th, 2018 6:00pm MDT

Record High TemperaturesWe knew the weekend was going to be a scorcher and sure enough, it has been thus far.

Today, the high temperature in Denver as measured at Denver International Airport topped out at 95 degrees at 4:00pm. This tied the record high temperature for June 9 last set in 2012.

Here in Thornton we matched that number with a 95 degree high of our own as well.

This was the second record high temperature reading of the past week as on Tuesday we tied the record high for June 5.

More heat is expected on Sunday with highs potentially coming in a couple of degrees warmer than today. We then will see a weak cold front cool things down slightly Monday and Tuesday but then the heat returns for the latter half of the workweek.  See our extended forecast for details.

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Thornton’s weekend weather to offer up hot temperatures, dry conditions

Friday, June 8th, 2018 4:56am MDT

Hot and dry will be the key weather words for the three day period. There will be little variation with temperatures far exceeding normal.

For Friday, we’ll see sunny skies this morning and then a few clouds in the afternoon and evening. Winds will be generally light. Temperatures today will top out in the mid-90s, well above the average high for the date of 80 degrees.

Saturday follows suit with a near clone of today’s weather. Expect to see similarly clear skies and unseasonably warm temperatures.

The weekend closes out with should be the hottest day of the period. Sunday will have a few more clouds but those aren’t expected to inhibit temperatures we expect a high around 98 degrees.

The record high temperature for today’s date is 98 degrees, for the 9th 95 degrees and the 10th 99 degrees. It would not be surprising to see one or two of those records fall. Have a great weekend and stay cool!

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