National Weather Service Forecast for: Longmont CO
Issued by: National Weather Service Denver-Boulder, CO
Updated: 3:59 am MDT May 30, 2025
 
Today

Today: A 30 percent chance of showers and thunderstorms after noon. Increasing clouds, with a high near 83. Light and variable wind becoming north 5 to 10 mph in the morning. Winds could gust as high as 16 mph.
Sunny then
Chance
T-storms
 Tonight

Tonight: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 52. North northwest wind 5 to 9 mph becoming light west northwest in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 20%.
Slight Chance
T-storms then
Mostly Clear
 Saturday

Saturday: Mostly sunny, with a high near 80. Light and variable wind becoming east northeast around 6 mph in the afternoon.
Mostly Sunny

 Saturday
Night
Saturday Night: Mostly clear, with a low around 53. East wind around 6 mph becoming calm in the evening.
Mostly Clear

 Sunday

Sunday: Sunny, with a high near 88. Calm wind becoming southeast around 6 mph in the afternoon.
Sunny

 Sunday
Night
Sunday Night: Partly cloudy, with a low around 57.
Partly Cloudy

 Monday

Monday: Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 84. Chance of precipitation is 60%.
Partly Sunny
then Showers
Likely
 Monday
Night
Monday Night: Showers and possibly a thunderstorm before midnight, then showers likely. Mostly cloudy, with a low around 52.
Showers

 Tuesday

Tuesday: A chance of showers, then showers and possibly a thunderstorm after noon. Mostly cloudy, with a high near 62.
Showers
Hi 83 °F Lo 52 °F Hi 80 °F Lo 53 °F Hi 88 °F Lo 57 °F Hi 84 °F Lo 52 °F Hi 62 °F

Hazardous Weather Outlook
 

Today
 
 A 30 percent chance of showers and thunderstorms after noon. Increasing clouds, with a high near 83. Light and variable wind becoming north 5 to 10 mph in the morning. Winds could gust as high as 16 mph.
Tonight
 
 A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 52. North northwest wind 5 to 9 mph becoming light west northwest in the evening. Winds could gust as high as 15 mph. Chance of precipitation is 20%.
Saturday
 
 Mostly sunny, with a high near 80. Light and variable wind becoming east northeast around 6 mph in the afternoon.
Saturday Night
 
 Mostly clear, with a low around 53. East wind around 6 mph becoming calm in the evening.
Sunday
 
 Sunny, with a high near 88. Calm wind becoming southeast around 6 mph in the afternoon.
Sunday Night
 
 Partly cloudy, with a low around 57.
Monday
 
 Showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 84. Chance of precipitation is 60%.
Monday Night
 
 Showers and possibly a thunderstorm before midnight, then showers likely. Mostly cloudy, with a low around 52.
Tuesday
 
 A chance of showers, then showers and possibly a thunderstorm after noon. Mostly cloudy, with a high near 62.
Tuesday Night
 
 Showers likely and possibly a thunderstorm before midnight, then a chance of showers. Mostly cloudy, with a low around 46.
Wednesday
 
 Showers likely and possibly a thunderstorm. Partly sunny, with a high near 68.
Wednesday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 48.
Thursday
 
 A chance of showers and thunderstorms. Mostly sunny, with a high near 77.

 

Forecast from NOAA-NWS for Longmont CO.