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

Areas of Extreme Heat and Fire Weather in the Pacific Northwest; Heavy Rain in the West and South-central US

Extreme heat will continue across the Pacific Northwest into midweek before finally waning. Hot temperatures, dry, gusty conditions, and isolated dry thunderstorms will bring critical fire weather. Heavy rain and thunderstorms are expected across portions of the Southwest, the Sierras, and the central/southern Plains. A series of storms will bring heavy rain and strong winds to southern Alaska. Read More >

Hazardous Weather Conditions

Current conditions at

Vance Brand Airport (KLMO)

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

Mostly Cloudy

59°F

15°C

Humidity 87%
Wind Speed Calm
Barometer 30.30 in
Dewpoint 55°F (13°C)
Visibility 7.00 mi
Last update 26 Aug 3:15 am MDT
Extended Forecast for

Longmont CO

  • Overnight

    Overnight: A 20 percent chance of showers. Mostly cloudy, with a steady temperature around 61. Calm wind.

    Low: 61 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers, then showers and thunderstorms likely after noon. Mostly cloudy, with a high near 78. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 60%.

    High: 78 °F

    Slight Chance
    Showers then
    T-storms
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 57. Light and variable wind. Chance of precipitation is 60%.

    Low: 57 °F

    Showers
    Likely then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers before noon, then showers likely and possibly a thunderstorm between noon and 3pm, then showers and thunderstorms likely after 3pm. Mostly cloudy, with a high near 79. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 70%.

    High: 79 °F

    Chance
    Showers then
    T-storms
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 56. North northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 56 °F

    Showers
    Likely then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers before noon, then showers likely and possibly a thunderstorm between noon and 3pm, then showers and thunderstorms likely after 3pm. Mostly cloudy, with a high near 76. Chance of precipitation is 70%.

    High: 76 °F

    Chance
    Showers then
    T-storms
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 55. Chance of precipitation is 60%.

    Low: 55 °F

    Showers
    Likely then
    Chance
    Showers

  • Friday

    Friday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 79.

    High: 79 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 54.

    Low: 54 °F

    Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of showers. Mostly cloudy, with a steady temperature around 61. Calm wind.
Tuesday
A slight chance of showers, then showers and thunderstorms likely after noon. Mostly cloudy, with a high near 78. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 60%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 57. Light and variable wind. Chance of precipitation is 60%.
Wednesday
A chance of showers before noon, then showers likely and possibly a thunderstorm between noon and 3pm, then showers and thunderstorms likely after 3pm. Mostly cloudy, with a high near 79. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 56. North northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Thursday
A chance of showers before noon, then showers likely and possibly a thunderstorm between noon and 3pm, then showers and thunderstorms likely after 3pm. Mostly cloudy, with a high near 76. Chance of precipitation is 70%.
Thursday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 55. Chance of precipitation is 60%.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 79.
Friday Night
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 54.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 78.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 53.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 77.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 54.
Labor Day
A chance of showers and thunderstorms. Mostly sunny, with a high near 80.
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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 ft)
Last Update:
2:25 pm MDT Aug 25, 2025
Forecast Valid:
3am MDT Aug 26, 2025-6pm MDT Sep 1, 2025
 
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