Portland, Oregon Climate by Month
Portland, Oregon, United States
Warm summers and cool winters, with rain spread through the year.
Warm summers and cool winters, with rain spread through the year: that's Portland's climate in short. Afternoon highs range from 46°F (8°C) in December to 81°F (27°C) in August, and December nights average 35°F (2°C). About 42 in (1058 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 81°F(27°C)
- Average high, August
- Coldest nights
- 35°F(2°C)
- Average low, December
- Rain per year
- 42 in(1058 mm)
- No clear rainy season
- Humidity
- 71%
- Sunniest: July
Best and worst months in Portland
Best for weatherThe most comfortable weather comes in June and September, with highs around 74°F (24°C) and about 1.6 in (40 mm) of rain a month.
Least pleasantDecember is the least pleasant month: it's the coldest, with highs of only 46°F (8°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Portland weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 47°F(8°C) | 36°F(2°C) | 5.9 in(150 mm) | 80% | 1.1 |
| FebFebruary | 51°F(11°C) | 36°F(2°C) | 4.3 in(109 mm) | 73% | 2.1 |
| MarMarch | 56°F(13°C) | 39°F(4°C) | 4.6 in(116 mm) | 72% | 2.9 |
| AprApril | 61°F(16°C) | 42°F(6°C) | 3.3 in(84 mm) | 69% | 4.1 |
| MayMay | 68°F(20°C) | 47°F(8°C) | 2.4 in(62 mm) | 67% | 5.1 |
| JunJuneBest | 73°F(23°C) | 52°F(11°C) | 1.7 in(42 mm) | 62% | 5.6 |
| JulJuly | 81°F(27°C) | 56°F(13°C) | 0.5 in(13 mm) | 60% | 6.3 |
| AugAugust | 81°F(27°C) | 55°F(13°C) | 0.7 in(19 mm) | 60% | 5.5 |
| SepSeptemberBest | 76°F(24°C) | 51°F(10°C) | 1.5 in(37 mm) | 66% | 4.1 |
| OctOctober | 64°F(18°C) | 44°F(7°C) | 3.8 in(97 mm) | 77% | 2.2 |
| NovNovember | 53°F(11°C) | 39°F(4°C) | 6.2 in(157 mm) | 87% | 1.3 |
| DecDecember | 46°F(8°C) | 35°F(2°C) | 6.8 in(172 mm) | 82% | 0.9 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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