Snohomish County Climate
Snohomish County, Washington
Avg Annual Temp
50.5°F
Annual Precip
54.1"
Annual Snowfall
3.6"
Extreme Heat Days
4.583333333333333
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Snohomish County Weather
Temperate and Consistently Moist
Snohomish County maintains an average annual temperature of 50.6°F, sitting just below the national median. With 54.1 inches of annual precipitation, the climate is characterized by frequent cloud cover and rain.
Slightly Warmer than the Washington Average
The 50.6°F annual average is slightly higher than the state's 49.9°F mean. Its 54.1 inches of rain puts it well above the state average of 38.5 inches, typical for the Puget Sound region.
Drier and Less Snowy than Pierce County
Snohomish County is significantly less snowy than Pierce County, receiving only 3.6 inches of snow compared to 38.3 inches. It also sees slightly less annual rainfall than its southern neighbor.
Mild Summers with Minimal Snowfall
July temperatures average 64.1°F with only 5 days of extreme heat above 90°F. Winters are mild but wet, with January averages around 39.1°F and very little frozen precipitation.
Focus on Reliable Rain Gear
With only 5 days of extreme heat, cooling is less critical than moisture management. Residents should prioritize high-quality rain shells and ensure home gutters are clear to handle the consistent annual rainfall.
Frequently Asked Questions
What is the average temperature in Snohomish County?
How much rain does Snohomish County get?
Does it snow in Snohomish County?
How hot does Snohomish County get in summer?
How cold are winters in Snohomish County?
Track your own weather in Snohomish 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.