Lewis County Climate
Lewis County, Washington
Avg Annual Temp
51.2°F
Annual Precip
53.2"
Annual Snowfall
12.9"
Extreme Heat Days
11.58
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Lewis County Weather
A Classic Temperate Profile
Lewis County's 51.2°F average temperature is very close to national medians. It experiences a balanced mix of mild temperatures and significant annual rainfall.
Warmer and Wetter Than Average
The county is slightly warmer than the 49.9°F state average. Its 53.2 inches of annual precipitation is significantly higher than the Washington average of 38.5 inches.
Moderate Compared to Coastal Neighbors
Lewis County's 53.2 inches of rain is heavy, but it is much drier than Mason County's 83.3 inches. It also sees more extreme heat than King County, with 12 days versus King's 3.
Consistent Rain and Mild Snow
Winters feature a January average of 39.1°F and 12.9 inches of snowfall. Summers are pleasant with a 65.5°F July average, though 12 days usually exceed 90°F.
Manage Moisture and Moderate Heat
With 53.2 inches of rain, moisture control in homes is a top priority for residents. Preparing for 12 days of extreme heat also makes basic cooling systems a wise investment.
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.