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

Hazardous Weather Conditions

Current conditions at

Vance Brand Airport (KLMO)

Lat: 40.16°NLon: 105.16°WElev: 5039ft.

Fair

33°C

91°F

Humidity 23%
Wind Speed NE 11 km/h
Barometer 30.10 in
Dewpoint 9°C (48°F)
Visibility 16 km
Heat Index31°C (88°F)
Last update 18 Jul 6:55 pm MDT
Extended Forecast for

Longmont CO

Heat Advisory July 19, 10:00am until July 20, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Mostly clear, with a low around 18. East wind 5 to 13 km/h becoming north northwest after midnight. Winds could gust as high as 24 km/h.

    Low: 18 °C

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 37. Northwest wind 5 to 10 km/h becoming east southeast in the afternoon.

    High: 37 °C

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 19. East wind 5 to 10 km/h becoming west northwest after midnight.

    Low: 19 °C

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 38. Light and variable wind becoming east 8 to 13 km/h in the morning. Winds could gust as high as 24 km/h.

    High: 38 °C

    Hot

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 19. East northeast wind 11 to 14 km/h becoming north northwest after midnight. Winds could gust as high as 27 km/h. Chance of precipitation is 30%.

    Low: 19 °C

    Chance
    T-storms then
    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 34.

    High: 34 °C

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 17.

    Low: 17 °C

    Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 34.

    High: 34 °C

    Mostly Sunny
    then Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 17.

    Low: 17 °C

    Chance
    T-storms then
    Slight Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 18. East wind 5 to 13 km/h becoming north northwest after midnight. Winds could gust as high as 24 km/h.
Sunday
Sunny and hot, with a high near 37. Northwest wind 5 to 10 km/h becoming east southeast in the afternoon.
Sunday Night
Mostly clear, with a low around 19. East wind 5 to 10 km/h becoming west northwest after midnight.
Monday
Sunny and hot, with a high near 38. Light and variable wind becoming east 8 to 13 km/h in the morning. Winds could gust as high as 24 km/h.
Monday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 19. East northeast wind 11 to 14 km/h becoming north northwest after midnight. Winds could gust as high as 27 km/h. Chance of precipitation is 30%.
Tuesday
A 40 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 34.
Tuesday Night
A 40 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 17.
Wednesday
Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 34.
Wednesday Night
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 17.
Thursday
Showers and thunderstorms likely after noon. Partly sunny, with a high near 32.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 17.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 32.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 17.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 33.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Longmont CO
 40.16°N 105.12°W (Elev. 5000 m)
Last Update:
12:46 pm MDT Jul 18, 2026
Forecast Valid:
7pm MDT Jul 18, 2026-6pm MDT Jul 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