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

Tropical Moisture Will Bring Heavy to Excessive Rainfall with Possible Flooding This Week

Tropical moisture from the remnants of Odalys and Hurricane Polo will surge over the southwest into the central U.S. this week with several days of heavy to excessive rainfall which may bring limited to considerable flooding. Flood Watches have been issued through Wednesday in the southwest U.S. and moderate risk outlooks have been issued today through Thursday. Read More >

Current conditions at

Vance Brand Airport (KLMO)

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

Fair

68°F

20°C

Humidity 56%
Wind Speed Calm
Barometer 29.89 in
Dewpoint 52°F (11°C)
Visibility 7.00 mi
Last update 28 Sep 6:15 pm MDT
Extended Forecast for

Longmont CO

  • Tonight

    Tonight: A 50 percent chance of showers. Mostly cloudy, with a low around 57. Southwest wind around 6 mph becoming light and variable in the evening.

    Low: 57 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 3pm. Cloudy, with a high near 68. Calm wind becoming north around 6 mph in the afternoon. Chance of precipitation is 30%.

    High: 68 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers. Cloudy, with a low around 54. North northwest wind 3 to 6 mph.

    Low: 54 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 66. North wind 5 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 60%.

    High: 66 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 51. North northwest wind 6 to 9 mph, with gusts as high as 15 mph.

    Low: 51 °F

    Chance
    Showers

  • Thursday

    Thursday: A 40 percent chance of showers before noon. Mostly sunny, with a high near 66.

    High: 66 °F

    Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 46.

    Low: 46 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

Detailed Forecast

Tonight
A 50 percent chance of showers. Mostly cloudy, with a low around 57. Southwest wind around 6 mph becoming light and variable in the evening.
Tuesday
A chance of showers, with thunderstorms also possible after 3pm. Cloudy, with a high near 68. Calm wind becoming north around 6 mph in the afternoon. Chance of precipitation is 30%.
Tuesday Night
A 50 percent chance of showers. Cloudy, with a low around 54. North northwest wind 3 to 6 mph.
Wednesday
Showers likely, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 66. North wind 5 to 10 mph, with gusts as high as 16 mph. Chance of precipitation is 60%.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 51. North northwest wind 6 to 9 mph, with gusts as high as 15 mph.
Thursday
A 40 percent chance of showers before noon. Mostly sunny, with a high near 66.
Thursday Night
Mostly clear, with a low around 46.
Friday
Sunny, with a high near 76.
Friday Night
Mostly clear, with a low around 49.
Saturday
Sunny, with a high near 75.
Saturday Night
Partly cloudy, with a low around 48.
Sunday
Sunny, with a high near 71.
Sunday Night
Partly cloudy, with a low around 48.
Monday
Sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Longmont CO
 40.19°N 105.09°W (Elev. 5010 ft)
Last Update:
12:46 pm MDT Sep 28, 2026
Forecast Valid:
6pm MDT Sep 28, 2026-6pm MDT Oct 5, 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