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Best time to visit · Oregon, United States
For the most comfortable weather in Portland, aim for June – September. July tops our comfort score at 94/100, with highs around 82°F (28°C) and 0.4 in (11 mm) of rain. May and October are good shoulder-season months. The toughest month is December, mainly because of rain.
These averages also cover Downtown Portland and Northwest Portland.
Highs run from 45°F to 84°F across the year, and the yearly total is about 58.4 in (1484 mm) of rain.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 47°F8°C | 49°F9°C | 53°F12°C | 58°F15°C | 66°F19°C | 72°F22°C | 82°F28°C | 84°F29°C | 77°F25°C | 63°F17°C | 52°F11°C | 45°F7°C |
| Avg low | 36°F2°C | 36°F2°C | 39°F4°C | 42°F5°C | 47°F9°C | 51°F11°C | 55°F13°C | 56°F13°C | 52°F11°C | 46°F8°C | 40°F4°C | 35°F2°C |
| Rain | 8.5 in216 mm | 5.7 in144 mm | 7.0 in178 mm | 4.7 in119 mm | 3.1 in79 mm | 2.2 in55 mm | 0.4 in11 mm | 0.8 in20 mm | 2.2 in57 mm | 5.4 in137 mm | 8.5 in217 mm | 9.9 in251 mm |
| Humidity | 92% | 89% | 87% | 84% | 82% | 80% | 70% | 65% | 68% | 80% | 89% | 92% |
| Cloud | 79% | 75% | 78% | 75% | 68% | 62% | 39% | 40% | 47% | 63% | 77% | 81% |
| Comfort | 33 | 47 | 49 | 66 | 83 | 88 | 94 | 89 | 92 | 76 | 43 | 26 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. Temperatures were adjusted from the grid cell's ~257 m (843 ft) to Portland's ~21 m (69 ft) elevation using the standard lapse rate of 6.5°C per 1,000 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The cold peaks here: highs of 45–49°F (7–9°C), and nights reach 35°F (2°C). It's the wettest season, with about 24.1 in (611 mm) of rain, 41% of the year's total. It holds the toughest stretch on our comfort score (December), averaging 35/100.
Temperatures climb through the season, from 53°F highs in March to 66°F by May. About 14.8 in (376 mm) of rain falls across these months, 25% of the year's total. Lows bottom out around 39°F (4°C). May score well without being the very best (season average 66/100).
Peak warmth: highs of 72–84°F (22–29°C). It's the driest season, with only about 3.4 in (86 mm) of rain, 6% of the year's total. Lows bottom out around 51°F (11°C). Comfort peaks here: June – August rank with the year's best, and the season averages 90/100.
Temperatures slide from 77°F highs in September to 52°F by November. About 16.2 in (411 mm) of rain falls across these months, 28% of the year's total. Lows bottom out around 40°F (4°C). September is among the best-scoring months (season average 70/100).
By comfort score: 6 Great, 1 Good, 2 Fair and 3 Tough. Great months: May – October. Tap a month for its own guide.
For the most comfortable weather in Portland, aim for June – September. July tops our comfort score at 94/100, with highs around 82°F (28°C) and 0.4 in (11 mm) of rain. May and October are good shoulder-season months. The toughest month is December, mainly because of rain.
December is the wettest month, averaging about 9.9 in (251 mm) of rain. July is the driest, with about 0.4 in (11 mm). The yearly total is around 58.4 in (1484 mm).
December is the coldest, with average lows of 35°F (2°C) and highs of 45°F (7°C). The warmest is August, with average highs of 84°F (29°C).
Not very: summer (June – August) humidity averages 72%, and highs peak around 84°F (29°C), so heat matters more than mugginess.
Not on average: even in December, the coldest month, lows average 35°F (2°C). Individual cold snaps can still dip lower.
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