Marion County Climate
Marion County, Oregon
Avg Annual Temp
52.7°F
Annual Precip
57.0"
Annual Snowfall
5.6"
Extreme Heat Days
12.166666666666666
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Marion County Weather
A Mild Valley Climate Profile
Marion County's 52.7°F average annual temperature is almost perfectly aligned with the national median. This reflects the temperate, stable environment of the Willamette Valley.
Warmer and Wetter Than Oregon's Average
Marion is over two degrees warmer than the Oregon state average of 50.5°F. It also receives 57.0 inches of annual precipitation, significantly more than the 37.4-inch state average.
Similar to Lane, Warmer than Linn
Marion's 52.7°F average is nearly identical to Lane County. It is noticeably warmer than Linn County, which averages 49.5°F and sees more annual snowfall.
Consistent Rain and Moderate Summers
The county experiences only 12 days of extreme heat above 90°F, keeping summers pleasant at 65.4°F. Winters are mild at 41.1°F and see a light 5.6 inches of snow.
Prioritize Rain Gear and Indoor Air Quality
With 57 inches of rain, residents should focus on maintaining home seals and high-quality rain jackets. Extreme heat is rare, so heavy AC usage is typically limited to a few weeks.
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.