National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

Current conditions at

Broomfield / Jeffco (KBJC)

Lat: 39.9°NLon: 105.1°WElev: 5551ft.

Partly Cloudy

63°F

17°C

Humidity 68%
Wind Speed SW 5 mph
Barometer 30.23 in
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 18 Sep 4:55 am MDT
Extended Forecast for

Thornton CO

  • Today

    Today: A slight chance of showers and thunderstorms between noon and 3pm, then showers likely and possibly a thunderstorm after 3pm. Partly sunny, with a high near 84. Calm wind becoming west northwest 5 to 7 mph in the afternoon. Chance of precipitation is 60%.

    High: 84 °F

    Partly Sunny
    then Showers
    Likely

  • Tonight

    Tonight: Showers likely and possibly a thunderstorm before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 57. West northwest wind 5 to 8 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 57 °F

    Showers
    Likely then
    Partly Cloudy

  • Saturday

    Saturday: A chance of showers and thunderstorms between noon and 3pm, then showers likely and possibly a thunderstorm after 3pm. Increasing clouds, with a high near 79. Calm wind becoming east northeast around 6 mph in the afternoon. Winds could gust as high as 16 mph. Chance of precipitation is 60%.

    High: 79 °F

    Sunny then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 55. North northeast wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 80%.

    Low: 55 °F

    Showers then
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 74. Calm wind becoming northeast 5 to 7 mph in the morning. Winds could gust as high as 17 mph. Chance of precipitation is 40%.

    High: 74 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Partly cloudy, with a low around 51. Chance of precipitation is 40%.

    Low: 51 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

  • Monday Night

    Monday Night: A slight chance of showers before midnight. Partly cloudy, with a low around 54.

    Low: 54 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A slight chance of showers and thunderstorms between noon and 3pm, then showers likely and possibly a thunderstorm after 3pm. Partly sunny, with a high near 84. Calm wind becoming west northwest 5 to 7 mph in the afternoon. Chance of precipitation is 60%.
Tonight
Showers likely and possibly a thunderstorm before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 57. West northwest wind 5 to 8 mph becoming calm in the evening. Chance of precipitation is 70%.
Saturday
A chance of showers and thunderstorms between noon and 3pm, then showers likely and possibly a thunderstorm after 3pm. Increasing clouds, with a high near 79. Calm wind becoming east northeast around 6 mph in the afternoon. Winds could gust as high as 16 mph. Chance of precipitation is 60%.
Saturday Night
Showers and possibly a thunderstorm. Low around 55. North northeast wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 80%.
Sunday
A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 74. Calm wind becoming northeast 5 to 7 mph in the morning. Winds could gust as high as 17 mph. Chance of precipitation is 40%.
Sunday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Partly cloudy, with a low around 51. Chance of precipitation is 40%.
Monday
Sunny, with a high near 75.
Monday Night
A slight chance of showers before midnight. Partly cloudy, with a low around 54.
Tuesday
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 78.
Tuesday Night
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 80.
Wednesday Night
Partly cloudy, with a low around 56.
Thursday
Mostly sunny, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Thornton CO
 39.89°N 104.95°W (Elev. 5197 ft)
Last Update:
12:46 am MDT Sep 18, 2026
Forecast Valid:
5am MDT Sep 18, 2026-6pm MDT Sep 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation