Grays Harbor County Climate
Grays Harbor County, Washington
Avg Annual Temp
50.6°F
Annual Precip
100.3"
Annual Snowfall
0.5"
Extreme Heat Days
2.7714285714285714
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Grays Harbor County Weather
Temperate and Exceptionally Wet
Grays Harbor County averages 50.6°F, which is cool compared to the national median but typical for a Pacific maritime climate. Its defining feature is the massive 100.3 inches of annual rainfall.
Triple the State Rainfall
While its temperature is near the state average of 49.9°F, its precipitation is nearly triple the Washington average of 38.5 inches. It is one of the wettest environments in the entire United States.
Maritime Mildness Over Snow
It is vastly wetter than inland counties like Grant or Douglas, which receive less than 10% of Grays Harbor's rain. Snow is rare here, with only 0.5 inches annually compared to the heavy drifts found eastward.
Mild Summers and Wet Winters
Summer is exceptionally mild, averaging just 60.2°F with only 3 days of extreme heat. Winters are wet and temperate, staying well above freezing with a 41.4°F average.
Built for the Rain
High-quality rain gear and moisture-resistant building materials are essential to handle over 100 inches of rain. Air conditioning is rarely needed, as temperatures almost never hit the 90°F mark.
Frequently Asked Questions
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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.