Grand County weather, town by town
3 places in Grand County, Utah, 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 2025. Station extremes, not official state records.
Grand County Weather Facts
Grand County has 3 places on myweatherrock (1 towns, 1 cities, 1 census-designated places), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 114°F at Moab on July 7, 1989. The coldest night is -24°F at Moab on January 22, 1930. The wettest day brought 4.02 inches of rain at Thompson Welcome Ctr on November 24, 1925. The biggest single-day snow measured 12.01 inches at Moab on January 11, 1905. Those are station measurements from NOAA's daily records, 1893 to 2025, not official state records. By area the largest place is Castle Valley, about 9 square miles.
About Grand County weather
The map on the Now tab shows every Grand 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 3 Grand County towns with station normals, the warmest month is July, when the day usually reaches 99°F, and the coldest is January, when the night usually falls to 20°F. February is the wettest, with rain on about 6 days. July afternoons run from about 96°F in Thompson Springs to 100°F in Castle Valley. January nights run from about 17°F in Thompson Springs to 21°F in Castle Valley.
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.
Grand County weather records
Measured at the NOAA stations serving these towns, daily records 1893 to 2025. Station extremes, not official state records.
Common questions about Grand County weather
- What is the hottest temperature recorded at a Grand County station?
- 114°F at Moab on July 7, 1989, in the NOAA daily station records myweatherrock holds (1893 to 2025).
- What is the coldest temperature recorded at a Grand County station?
- -24°F at Moab on January 22, 1930.
- What is the most rain a Grand County station has measured in one day?
- 4.02 inches at Thompson Welcome Ctr on November 24, 1925.
- What is the biggest one-day snowfall at a Grand County station?
- 12.01 inches at Moab on January 11, 1905.
- How many Grand County towns have a weather page here?
- 3: 1 towns, 1 cities, 1 census-designated places. 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 Grand 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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