Portland, OR Weather & Climate Normals
What a normal year in Portland actually looks like
On the 30-year record NOAA keeps for Portland, OR, the comfort score comes out to 60/100, mild with real seasons: A solid stretch of comfortable months alongside a noticeable but not extreme summer or winter. Only 6 months a year land in the 55–75°F range this site treats as mild.
How much Portland's weather actually swings
Average temperatures in Portland run from 42°F in Dec up to 70°F in Aug, a 28°F seasonal swing, a middling gap by national standards.
Portland, month by month
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 47°F | 37°F | 6.36in | 1.3in |
| Feb | 51°F | 39°F | 4.74in | 1.4in |
| Mar | 56°F | 41°F | 4.83in | 0in |
| Apr | 61°F | 44°F | 3.63in | 0in |
| May | 68°F | 49°F | 2.58in | 0in |
| Jun | 73°F | 53°F | 1.49in | 0in |
| Jul | 80°F | 58°F | 0.43in | 0in |
| Aug | 81°F | 59°F | 0.54in | 0in |
| Sep | 75°F | 55°F | 1.58in | 0in |
| Oct | 63°F | 48°F | 3.96in | 0in |
| Nov | 52°F | 42°F | 6.58in | 0in |
| Dec | 46°F | 37°F | 7.35in | 0.9in |
If you're timing a visit, May, Jun, Jul, Aug, Sep, and Oct are Portland's mildest stretch; if you're moving there, you should plan around Dec's cold instead.
How wet Portland actually gets
Over a typical year, Portland sees about 44.07in of precipitation a year across roughly 155 days with measurable rain or snow, with 3.6in of snow a year.
Portland against the rest of the country
Out of 4876 cities scored here, Portland comes in at 496; within OR alone it ranks 3 of 80. Population is about 635,749.
Checking the actual forecast
These figures come from Portland Kgw-Tv, OR US, the NOAA station 2.3 miles from Portland, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why this uses the nearest NOAA station · How the comfort score is calculated