Cowlitz County Climate
Cowlitz County, Washington
Avg Annual Temp
53.2°F
Annual Precip
61.4"
Annual Snowfall
3.0"
Extreme Heat Days
9.5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Cowlitz County Weather
A warm and exceptionally wet county
Cowlitz County's 53.2°F average temperature is near the national median. Its 61.4 inches of annual precipitation makes it one of the wettest regions in the country.
One of Washington's wettest, warmest areas
The county is significantly warmer and wetter than the state averages of 49.9°F and 38.5 inches. It ranks high for total annual rainfall in Washington.
Wetter than Clark and Clallam counties
With 61.4 inches of rain, Cowlitz outpaces both Clark (44 inches) and Clallam (58.7 inches). It maintains a mild temperature that mirrors its southern neighbors.
Mild winters and damp, cool summers
Summer averages 64.8°F with 10 days of heat over 90°F. Winter is notably mild at 41.8°F, seeing only 3.0 inches of snow despite heavy overall precipitation.
Focus on moisture and mold prevention
Dehumidifiers and waterproof home coatings are essential for managing 61.4 inches of rain. Outdoor gear should prioritize breathability to handle the mild but constant dampness.
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.