Multnomah County · Oregon
Portland, OR weather averages
NOAA climate normals for 1991-2020, measured at Portland Intl Ap, 17 km from the city centre — month by month temperature, rain and snow.
Quick answer
Portland averages a daily high of 63.2°F and a daily low of 45.7°F across the year, with 36.03 inches of precipitation. August is the warmest month at 81.1°F and December the coldest at 35.2°F.
- Average annual high
- 63.2°FWarmest month August
- Average annual low
- 45.7°FColdest month December
- Precipitation per year
- 36.03 inWettest month November
- Snowfall per year
- 4.3 in29.6 days at or below 32°F
Portland weather month by month
Normal daily high and low, precipitation and snowfall for each month, 1991-2020.
| Month | High °F | Low °F | Precip in | Snow in | Range |
|---|---|---|---|---|---|
| January | 47 | 35.8 | 4.88 | 0.5 | 35.8 to 47 degrees |
| February | 51.3 | 36.3 | 3.66 | 2.1 | 36.3 to 51.3 degrees |
| March | 56.7 | 39.6 | 3.68 | 0.2 | 39.6 to 56.7 degrees |
| April | 61.4 | 43.1 | 2.73 | 0 | 43.1 to 61.4 degrees |
| May | 68 | 48.6 | 2.47 | 0 | 48.6 to 68 degrees |
| June | 73.5 | 53.6 | 1.7 | 0 | 53.6 to 73.5 degrees |
| July | 80.6 | 57.8 | 0.65 | 0 | 57.8 to 80.6 degrees |
| August | 81.1 | 58 | 0.67 | 0 | 58 to 81.1 degrees |
| September | 75.8 | 53.1 | 1.47 | 0 | 53.1 to 75.8 degrees |
| October | 63.8 | 46 | 3 | 0 | 46 to 63.8 degrees |
| November | 52.8 | 40.5 | 5.63 | 0.2 | 40.5 to 52.8 degrees |
| December | 45.6 | 35.2 | 5.49 | 1.3 | 35.2 to 45.6 degrees |
Source: NOAA NCEI, U.S. Climate Normals 1991-2020 — station USW00024229, Portland Intl Ap · rates as published for 1991-2020 normals
How to read Portland climate normals
What a climate normal is, and what it is not.
A normal is the average of thirty years of daily observations at one station — here Portland Intl Ap, 17 km from the centre of Portland. It describes a typical year, so any single year will run warmer, cooler, wetter or drier. Readings taken at an airport on the edge of town usually sit a degree or two below a dense downtown on summer nights. Portland sees about 12 days a year at or above 90°F and about 91 days with a tenth of an inch of precipitation or more.
Keep going
Other Portland data on this site.