National Weather Service Forecast for: Longmont CO
Issued by: National Weather Service Denver-Boulder, CO
Updated: 2:46 am MDT Jul 13, 2026
 
Overnight

Overnight: Clear, with a low around 63. West wind around 5 mph.
Clear

 Monday

Monday: Sunny and hot, with a high near 100. Light and variable wind becoming east southeast 5 to 10 mph in the afternoon. Winds could gust as high as 16 mph.
Hot

 Monday
Night
Monday Night: Mostly clear, with a low around 65. East southeast wind 5 to 11 mph becoming north northwest after midnight. Winds could gust as high as 24 mph.
Mostly Clear

 Tuesday

Tuesday: Sunny and hot, with a high near 98. Breezy, with a north northwest wind 5 to 15 mph becoming east southeast in the afternoon. Winds could gust as high as 26 mph.
Sunny then
Sunny and
Breezy
 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 64. Breezy, with an east southeast wind 11 to 16 mph becoming light and variable after midnight. Winds could gust as high as 33 mph.
Mostly Clear
and Breezy
then Mostly
Clear
 Wednesday

Wednesday: Sunny, with a high near 96. Breezy.
Sunny then
Sunny and
Breezy
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 64. Breezy.
Mostly Clear
and Breezy
then Mostly
Clear
 Thursday

Thursday: Sunny, with a high near 96.
Sunny

 Thursday
Night
Thursday Night: Mostly clear, with a low around 64.
Mostly Clear
Lo 63 °F Hi 100 °F Lo 65 °F Hi 98 °F Lo 64 °F Hi 96 °F Lo 64 °F Hi 96 °F Lo 64 °F

Heat Advisory
Air Quality Alert
 

Overnight
 
 Clear, with a low around 63. West wind around 5 mph.
Monday
 
 Sunny and hot, with a high near 100. Light and variable wind becoming east southeast 5 to 10 mph in the afternoon. Winds could gust as high as 16 mph.
Monday Night
 
 Mostly clear, with a low around 65. East southeast wind 5 to 11 mph becoming north northwest after midnight. Winds could gust as high as 24 mph.
Tuesday
 
 Sunny and hot, with a high near 98. Breezy, with a north northwest wind 5 to 15 mph becoming east southeast in the afternoon. Winds could gust as high as 26 mph.
Tuesday Night
 
 Mostly clear, with a low around 64. Breezy, with an east southeast wind 11 to 16 mph becoming light and variable after midnight. Winds could gust as high as 33 mph.
Wednesday
 
 Sunny, with a high near 96. Breezy.
Wednesday Night
 
 Mostly clear, with a low around 64. Breezy.
Thursday
 
 Sunny, with a high near 96.
Thursday Night
 
 Mostly clear, with a low around 64.
Friday
 
 Sunny, with a high near 96.
Friday Night
 
 Partly cloudy, with a low around 65.
Saturday
 
 A slight chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Saturday Night
 
 Partly cloudy, with a low around 65.
Sunday
 
 A slight chance of showers and thunderstorms. Mostly sunny, with a high near 94.

 

Forecast from NOAA-NWS for Longmont CO.