Gallatin County weather, town by town
18 places in Gallatin County, Montana, 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 1892 to 2026. Station extremes, not official state records.
Gallatin County Weather Facts
Gallatin County has 18 places on myweatherrock (13 census-designated places, 3 cities, 2 towns), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 106°F at Bozeman Gallatin Fld Ap on July 6, 2007. The coldest night is -49°F at West Yellowstone on December 22, 2022. The wettest day brought 4.2 inches of rain at Albro Lake on October 3, 2013. The biggest single-day snow measured 24.02 inches at Bozeman Montana State Univ on November 12, 2009. Those are station measurements from NOAA's daily records, 1892 to 2026, not official state records. By area the largest place is Big Sky, about 120 square miles.
About Gallatin County weather
The map on the Now tab shows every Gallatin 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 18 Gallatin County towns with station normals, the warmest month is July, when the day usually reaches 81°F, and the coldest is December, when the night usually falls to 11°F. May is the wettest, with rain on about 13 days. July afternoons run from about 68°F in Big Sky to 86°F in Amsterdam. December nights run from about 5°F in Hebgen Lake Estates to 17°F in Sedan.
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.
Gallatin County weather records
Measured at the NOAA stations serving these towns, daily records 1892 to 2026. Station extremes, not official state records.
Common questions about Gallatin County weather
- What is the hottest temperature recorded at a Gallatin County station?
- 106°F at Bozeman Gallatin Fld Ap on July 6, 2007, in the NOAA daily station records myweatherrock holds (1892 to 2026).
- What is the coldest temperature recorded at a Gallatin County station?
- -49°F at West Yellowstone on December 22, 2022.
- What is the most rain a Gallatin County station has measured in one day?
- 4.2 inches at Albro Lake on October 3, 2013.
- What is the biggest one-day snowfall at a Gallatin County station?
- 24.02 inches at Bozeman Montana State Univ on November 12, 2009.
- How many Gallatin County towns have a weather page here?
- 18: 13 census-designated places, 3 cities, 2 towns. 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 Gallatin 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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