| National Weather Service Forecast for:
Longmont CO Issued by: National Weather Service Denver-Boulder, CO |
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| Updated: 12:46 pm MDT Sep 12, 2026 | ||||||||||||||||||
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| Tonight |
Mostly clear, with a low around 57. Light and variable wind. |
| Sunday |
A chance of showers between 2pm and 3pm, then a chance of showers and thunderstorms after 3pm. Increasing clouds, with a high near 92. Calm wind becoming southeast 5 to 9 mph in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 30%. |
| Sunday Night |
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. West wind around 6 mph becoming calm after midnight. Chance of precipitation is 30%. |
| Monday |
A 20 percent chance of showers and thunderstorms after noon. Partly sunny, with a high near 87. Calm wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 15 mph. |
| Monday Night |
A slight chance of showers and thunderstorms, then a chance of showers after 9pm. Mostly cloudy, with a low around 54. West northwest wind 5 to 8 mph becoming calm. Chance of precipitation is 30%. |
| Tuesday |
A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 75. Chance of precipitation is 50%. |
| Tuesday Night |
A 50 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 53. |
| Wednesday |
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 82. |
| Wednesday Night |
A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 53. |
| Thursday |
A slight chance of showers, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 76. |
| Thursday Night |
A chance of showers. Mostly cloudy, with a low around 52. |
| Friday |
A chance of showers and thunderstorms. Mostly sunny, with a high near 79. |
| Friday Night |
A slight chance of showers. Partly cloudy, with a low around 51. |
| Saturday |
Mostly sunny, with a high near 78. |
Forecast from NOAA-NWS for Longmont CO.