National Weather Service Forecast for: Longmont CO
Issued by: National Weather Service Denver-Boulder, CO
Updated: 3:16 pm MST Dec 17, 2025
 
Tonight

Tonight: A chance of rain before 10pm, then a chance of snow between 10pm and 11pm. Partly cloudy, with a low around 28. Breezy, with a northwest wind 14 to 23 mph, with gusts as high as 39 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
Chance
Rain/Snow and
Breezy then
Mostly Clear
and Blustery
 Thursday

Thursday: Sunny, with a high near 49. West northwest wind 8 to 13 mph becoming south southeast in the afternoon. Winds could gust as high as 22 mph.
Sunny


 Thursday
Night
Thursday Night: Partly cloudy, with a low around 31. South wind 7 to 11 mph becoming west after midnight. Winds could gust as high as 24 mph.
Partly Cloudy


 Friday

Friday: Mostly sunny, with a high near 66. Breezy, with a west wind 14 to 24 mph, with gusts as high as 36 mph.
Mostly Sunny
and Breezy

 Friday
Night
Friday Night: A 20 percent chance of rain after 11pm. Partly cloudy, with a low around 42. Breezy, with a west wind 9 to 18 mph, with gusts as high as 37 mph.
Slight Chance
Rain and
Breezy

 Saturday

Saturday: A 30 percent chance of rain, mainly before 11am. Mostly sunny, with a high near 55.
Chance Rain


 Saturday
Night
Saturday Night: Partly cloudy, with a low around 28.
Partly Cloudy


 Sunday

Sunday: Mostly sunny, with a high near 54.
Mostly Sunny


 Sunday
Night
Sunday Night: Partly cloudy, with a low around 34.
Partly Cloudy
Lo 28 °F Hi 49 °F Lo 31 °F Hi 66 °F Lo 42 °F Hi 55 °F Lo 28 °F Hi 54 °F Lo 34 °F

High Wind Warning
Hazardous Weather Outlook
High Wind Watch
Fire Weather Watch
 

Tonight
 
 A chance of rain before 10pm, then a chance of snow between 10pm and 11pm. Partly cloudy, with a low around 28. Breezy, with a northwest wind 14 to 23 mph, with gusts as high as 39 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
Thursday
 
 Sunny, with a high near 49. West northwest wind 8 to 13 mph becoming south southeast in the afternoon. Winds could gust as high as 22 mph.
Thursday Night
 
 Partly cloudy, with a low around 31. South wind 7 to 11 mph becoming west after midnight. Winds could gust as high as 24 mph.
Friday
 
 Mostly sunny, with a high near 66. Breezy, with a west wind 14 to 24 mph, with gusts as high as 36 mph.
Friday Night
 
 A 20 percent chance of rain after 11pm. Partly cloudy, with a low around 42. Breezy, with a west wind 9 to 18 mph, with gusts as high as 37 mph.
Saturday
 
 A 30 percent chance of rain, mainly before 11am. Mostly sunny, with a high near 55.
Saturday Night
 
 Partly cloudy, with a low around 28.
Sunday
 
 Mostly sunny, with a high near 54.
Sunday Night
 
 Partly cloudy, with a low around 34.
Monday
 
 Mostly sunny, with a high near 65.
Monday Night
 
 Partly cloudy, with a low around 34.
Tuesday
 
 Mostly sunny, with a high near 58.
Tuesday Night
 
 Partly cloudy, with a low around 33.
Wednesday
 
 Mostly sunny, with a high near 62.

 

Forecast from NOAA-NWS for Longmont CO.