Boulder County weather, town by town
31 places in Boulder County, Colorado, each with its own live forecast and radar, and where a station sits close enough, measured weather records.
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Measured at the NOAA stations serving these towns, daily records 1893 to 2026. Station extremes, not official state records.
Boulder County Weather Facts
Boulder County has 31 places on myweatherrock (22 census-designated places, 5 towns, 4 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 110°F at Northglenn on August 2, 2008. The coldest night is -38°F at Longmont 2 Ese on January 16, 1930. The wettest day brought 8.87 inches of rain at Boulder 1.3 Nw on September 12, 2013. The biggest single-day snow measured 45.98 inches at Nederland 2.61 Nne on March 19, 2003. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is Longmont, about 29 square miles.
About Boulder County weather
The map on the Now tab shows every Boulder County town's current temperature from our own server, one dot per town. Tap any dot, or type a town above, for that town's full forecast.
What the weather is usually like
Across the 31 Boulder County towns with station normals, the warmest month is July, when the day usually reaches 82°F, and the coldest is January, when the night usually falls to 17°F. May is the wettest, with rain on about 12 days. July afternoons run from about 68°F in Bonanza Mountain Estates to 91°F in Lafayette. January nights run from about 11°F in Bark Ranch to 22°F in Altona.
Means of the 1991 to 2020 station normals serving these towns, as published by NOAA; each town's page carries its own.
Where these numbers come from
- Current conditions and forecast: NOAA forecast grids decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
- Records: computed by myweatherrock from NOAA GHCN-Daily station records at the stations serving these towns. Measurements, not estimates.
- Warnings and alerts: the National Weather Service, passed through unchanged.
Boulder County weather records
Measured at the NOAA stations serving these towns, daily records 1893 to 2026. Station extremes, not official state records.
Common questions about Boulder County weather
- What is the hottest temperature recorded at a Boulder County station?
- 110°F at Northglenn on August 2, 2008, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Boulder County station?
- -38°F at Longmont 2 Ese on January 16, 1930.
- What is the most rain a Boulder County station has measured in one day?
- 8.87 inches at Boulder 1.3 Nw on September 12, 2013.
- What is the biggest one-day snowfall at a Boulder County station?
- 45.98 inches at Nederland 2.61 Nne on March 19, 2003.
- How many Boulder County towns have a weather page here?
- 31: 22 census-designated places, 5 towns, 4 cities. Each page carries current conditions, the hourly timeline, the ten day outlook, radar, and where a station sits close enough, measured records.
- Where does the Boulder County forecast come from?
- NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
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