Mason County Climate
Mason County, Washington
Avg Annual Temp
51.3°F
Annual Precip
83.3"
Annual Snowfall
3.2"
Extreme Heat Days
6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Mason County Weather
A Very Wet Marine Climate
Mason County's 51.3°F average temperature is typical for the region, but its precipitation is extreme by national standards. The county is defined by its high moisture and moderate temperatures.
Double the State Average Rainfall
The county receives a staggering 83.3 inches of precipitation annually, more than double the state average of 38.5 inches. Its 51.3°F temperature is slightly warmer than the state mean.
The Rain Capital of the Region
Mason's 83.3 inches of rain dwarfs King County's 64.2 inches and Kitsap's 56.9 inches. However, it stays very similar in temperature to its Puget Sound neighbors.
Rainy Winters and Mild Summers
Snow is rare here, with only 3.2 inches falling annually. Summers are very comfortable with a July average of 64.7°F and only 6 days of extreme heat per year.
Invest in Quality Rain Gear
With 83.3 inches of rain, residents should prioritize roof maintenance and high-end waterproof clothing. Air conditioning is rarely a necessity given the consistent marine cooling.
Frequently Asked Questions
What is the average temperature in Mason County?
How much rain does Mason County get?
Does it snow in Mason County?
How hot does Mason County get in summer?
How cold are winters in Mason County?
Track your own weather in Mason County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.