National Weather Service Forecast for: Longmont CO
Issued by: National Weather Service Denver-Boulder, CO
Updated: 12:46 pm MDT May 26, 2026
 
This
Afternoon
This Afternoon: A 20 percent chance of showers and thunderstorms.  Partly sunny, with a high near 82. Breezy, with a south southeast wind 17 to 20 mph, with gusts as high as 31 mph.
Slight Chance
T-storms and
Breezy
Tonight

Tonight: A slight chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight.  Mostly cloudy, with a low around 54. Breezy, with a south southeast wind 11 to 16 mph becoming light and variable  after midnight. Winds could gust as high as 25 mph.  Chance of precipitation is 30%.
Chance
Showers and
Breezy then
Mostly Cloudy
Wednesday

Wednesday: Showers likely and possibly a thunderstorm, mainly after noon.  Mostly cloudy, with a high near 75. Calm wind becoming east southeast 5 to 8 mph in the afternoon.  Chance of precipitation is 60%.
Chance
Showers then
Showers
Likely
Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight.  Mostly cloudy, with a low around 54. South wind 5 to 7 mph becoming calm  in the evening.  Chance of precipitation is 40%.
Chance
T-storms then
Mostly Cloudy
Thursday

Thursday: A 40 percent chance of showers and thunderstorms after noon.  Partly sunny, with a high near 80. Calm wind becoming southeast 5 to 7 mph in the afternoon. Winds could gust as high as 16 mph.
Mostly Cloudy
then Chance
T-storms
Thursday
Night
Thursday Night: A 40 percent chance of showers and thunderstorms before midnight.  Mostly cloudy, with a low around 54.
Chance
T-storms then
Partly Cloudy
Friday

Friday: A 40 percent chance of showers and thunderstorms after noon.  Partly sunny, with a high near 82.
Mostly Sunny
then Chance
T-storms
Friday
Night
Friday Night: A chance of showers and thunderstorms before midnight.  Mostly cloudy, with a low around 54.
Chance
T-storms then
Mostly Cloudy
Saturday

Saturday: A chance of showers and thunderstorms after noon.  Partly sunny, with a high near 80.
Mostly Sunny
then Chance
T-storms
Hi 82 °F Lo 54 °F Hi 75 °F Lo 54 °F Hi 80 °F Lo 54 °F Hi 82 °F Lo 54 °F Hi 80 °F

 

This Afternoon
 
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. Breezy, with a south southeast wind 17 to 20 mph, with gusts as high as 31 mph.
Tonight
 
A slight chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 54. Breezy, with a south southeast wind 11 to 16 mph becoming light and variable after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 30%.
Wednesday
 
Showers likely and possibly a thunderstorm, mainly after noon. Mostly cloudy, with a high near 75. Calm wind becoming east southeast 5 to 8 mph in the afternoon. Chance of precipitation is 60%.
Wednesday Night
 
A chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, with a low around 54. South wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 40%.
Thursday
 
A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 80. Calm wind becoming southeast 5 to 7 mph in the afternoon. Winds could gust as high as 16 mph.
Thursday Night
 
A 40 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 54.
Friday
 
A 40 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 82.
Friday Night
 
A chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 54.
Saturday
 
A chance of showers and thunderstorms after noon. Partly sunny, with a high near 80.
Saturday Night
 
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Partly cloudy, with a low around 51.
Sunday
 
A chance of showers and thunderstorms. Mostly sunny, with a high near 80.
Sunday Night
 
A chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Monday
 
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 79.

 

Forecast from NOAA-NWS for Longmont CO.