Multnomah County Climate
Multnomah County, Oregon
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.4°F
Annual Precip
49.1"
Annual Snowfall
5.4"
Extreme Heat Days
14
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9a
Minimum winter temperature range for plant survival
2,662
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Multnomah County
Climate Verdict
Multnomah County has a mild, with an average annual temperature of 54.4°F, moderately wet with 49.1 inches of annual precipitation, rare extreme heat with only 13.839999999999998 days above 90°F annually, light snow averaging 5.4 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 41.2°F. summers are pleasantly cool with July averaging 69.2°F. The climate is remarkably stable year-round, with only a 28°F difference between January and July. December is typically the coldest month and August the warmest.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Multnomah County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Multnomah County is 3.9°F warmer than the Oregon statewide average of 50.5°F, it is also noticeably wetter, receiving 11.7 inches more precipitation than the state average.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.