Multnomah County Climate
Multnomah County, Oregon
Avg Annual Temp
54.4°F
Annual Precip
49.1"
Annual Snowfall
5.4"
Extreme Heat Days
13.839999999999998
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Multnomah County Weather
Temperately Topping the National Median
Multnomah County averages 54.4°F annually, making it slightly warmer than the national median. This marine-influenced climate pairs mild temperatures with a robust 49.1 inches of annual precipitation.
One of Oregon's Warmest Hubs
At 54.4°F, the county sits nearly four degrees above the Oregon state average of 50.5°F. It also receives about 12 inches more rain annually than the typical Oregon county.
Milder Winters Than the Interior
Compared to nearby Polk County's 50.1°F average, Multnomah remains notably warmer. Its 41.9°F winter average is significantly higher than eastern neighbors like Sherman County.
Wet Winters and Moderate Summer Heat
The county sees 14 days of extreme heat annually, with July temperatures averaging a comfortable 69.2°F. Most of the 49.1 inches of precipitation falls as rain, as the area only sees 5.4 inches of snow.
Gear Up for Rain and Humidity
High-quality rain gear is a daily necessity given the frequent precipitation. While extreme heat is less frequent than in the east, the 14 days above 90°F increasingly make portable AC units 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.