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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Boulder Municipal Airport (KBDU)

Lat: 40.04°NLon: 105.23°WElev: 5288ft.

Fair

59°F

15°C

Humidity 72%
Wind Speed W 3 mph
Barometer 30.18 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 18 Sep 11:55 pm MDT
Extended Forecast for

Boulder CO

  • Overnight

    Overnight: Partly cloudy, with a low around 55. Light west wind.

    Low: 55 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 76. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 70%.

    High: 76 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 10pm, then a slight chance of showers after 5am. Partly cloudy, with a low around 50. Light and variable wind. Chance of precipitation is 50%.

    Low: 50 °F

    Chance
    Showers then
    Slight Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 71. Light and variable wind. Chance of precipitation is 40%.

    High: 71 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before midnight. Partly cloudy, with a low around 49. Light and variable wind.

    Low: 49 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny
    then Chance
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 53.

    Low: 53 °F

    Slight Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 55. Light west wind.
Saturday
A chance of showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 76. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 70%.
Saturday Night
A chance of showers and thunderstorms before 10pm, then a slight chance of showers after 5am. Partly cloudy, with a low around 50. Light and variable wind. Chance of precipitation is 50%.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 71. Light and variable wind. Chance of precipitation is 40%.
Sunday Night
A 30 percent chance of showers before midnight. Partly cloudy, with a low around 49. Light and variable wind.
Monday
Sunny, with a high near 73.
Monday Night
Mostly clear, with a low around 51.
Tuesday
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 77.
Tuesday Night
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 53.
Wednesday
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 77.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 53.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 77.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 54.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Boulder CO
 40.02°N 105.28°W (Elev. 5400 ft)
Last Update:
12:46 pm MDT Sep 18, 2026
Forecast Valid:
12am MDT Sep 19, 2026-6pm MDT Sep 25, 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