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

Tropical System in the Gulf; Dangerous Heat and Air Quality Concerns; Severe Thunderstorms for Midwest to mid-Atlantic

Tropical system in the Gulf expected to gradually strengthen the next couple of days off the Florida Panhandle and Alabama coasts. Instances of flash flooding will be possible through Thursday along the eastern and central Gulf Coast. Severe thunderstorms will develop and move along a cold front crossing the Upper Midwest, and through the Ohio Valley/Mid-Atlantic on Tuesday. Read More >

Hazardous Weather Conditions

Current conditions at

Boulder Municipal Airport (KBDU)

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

Fair

95°F

35°C

Humidity 16%
Wind Speed W 10 mph
Barometer 30.06 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 20 Jul 4:55 pm MDT
Extended Forecast for

Boulder CO

Heat Advisory July 20, 05:04pm until July 20, 09:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 20, 05:04pm until July 20, 09:00pm

    NOW until 9:00pm Mon

    Heat Advisory

  • This Afternoon

    High: 98 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 68. Northwest wind 5 to 7 mph. Chance of precipitation is 20%.

    Low: 68 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 93. North northwest wind 5 to 9 mph becoming east southeast in the afternoon. Winds could gust as high as 16 mph.

    High: 93 °F

    Sunny then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly before 9pm. Partly cloudy, with a low around 64. East southeast wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 16 mph.

    Low: 64 °F

    Chance
    T-storms then
    Mostly Clear

  • Wednesday

    Wednesday: Showers and thunderstorms likely after noon. Partly sunny, with a high near 92. Calm wind becoming north around 6 mph in the morning. Chance of precipitation is 70%.

    High: 92 °F

    Mostly Sunny
    then T-storms
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Thursday

    Thursday: A chance of showers, then showers and thunderstorms likely after noon. Mostly cloudy, with a high near 87. Chance of precipitation is 70%.

    High: 87 °F

    Chance
    Showers then
    T-storms
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Chance
    T-storms then
    Slight Chance
    Showers

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 98. Northeast wind around 7 mph.
Tonight
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Partly cloudy, with a low around 68. Northwest wind 5 to 7 mph. Chance of precipitation is 20%.
Tuesday
A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 93. North northwest wind 5 to 9 mph becoming east southeast in the afternoon. Winds could gust as high as 16 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly before 9pm. Partly cloudy, with a low around 64. East southeast wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 16 mph.
Wednesday
Showers and thunderstorms likely after noon. Partly sunny, with a high near 92. Calm wind becoming north around 6 mph in the morning. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Thursday
A chance of showers, then showers and thunderstorms likely after noon. Mostly cloudy, with a high near 87. Chance of precipitation is 70%.
Thursday Night
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 63.
Friday
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 91.
Friday Night
Partly cloudy, with a low around 65.
Saturday
A slight chance of showers and thunderstorms. Sunny, with a high near 95.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 65.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 93.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Boulder CO
 40.02°N 105.25°W (Elev. 5358 ft)
Last Update:
12:46 pm MDT Jul 20, 2026
Forecast Valid:
5pm MDT Jul 20, 2026-6pm MDT Jul 27, 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