Mason County weather, town by town
7 places in Mason County, Washington, 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 1899 to 2026. Station extremes, not official state records.
Mason County Weather Facts
Mason County has 7 places on myweatherrock (6 census-designated places, 1 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 Shelton Ap on June 28, 2021. The coldest night is 6°F at Shelton Ap on December 22, 1998. The wettest day brought 8.3 inches of rain at Cushman Powerhouse #2 on October 20, 2003. The biggest single-day snow measured 20 inches at Seattle Tacoma Ap on January 13, 1950. Those are station measurements from NOAA's daily records, 1899 to 2026, not official state records. By area the largest place is Belfair, about 7 square miles.
About Mason County weather
The map on the Now tab shows every Mason 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 7 Mason County towns with station normals, the warmest month is August, when the day usually reaches 76°F, and the coldest is February, when the night usually falls to 35°F. January is the wettest, with rain on about 20 days. August afternoons run from about 75°F in Grapeview to 78°F in Shelton. February nights run from about 32°F in Shelton to 37°F in Grapeview.
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.
Mason County weather records
Measured at the NOAA stations serving these towns, daily records 1899 to 2026. Station extremes, not official state records.
Common questions about Mason County weather
- What is the hottest temperature recorded at a Mason County station?
- 110°F at Shelton Ap on June 28, 2021, in the NOAA daily station records myweatherrock holds (1899 to 2026).
- What is the coldest temperature recorded at a Mason County station?
- 6°F at Shelton Ap on December 22, 1998.
- What is the most rain a Mason County station has measured in one day?
- 8.3 inches at Cushman Powerhouse #2 on October 20, 2003.
- What is the biggest one-day snowfall at a Mason County station?
- 20 inches at Seattle Tacoma Ap on January 13, 1950.
- How many Mason County towns have a weather page here?
- 7: 6 census-designated places, 1 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 Mason 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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