United States of America
Portland sees feels-like daytime highs peak around 32.2°C in July and nighttime lows bottom out near 1.8°C in December. December is the wettest month (~228 mm), while July is the driest (~15 mm). For sunshine, August leads with about 77% clear skies.
Based on mild feels-like temperatures and low rain chances, the most comfortable months are September, June, and August — expect around 14.9–27.7°C with roughly 19% chance of rain on a given day in September.
| Month | Low / High °C | Rain % | Rainfall | Clear skies | Wind |
|---|---|---|---|---|---|
| January | 1.9° / 7.4° | 47% | 196 mm | 25% | 9.8 kph |
| February | 3.6° / 10.8° | 44% | 162 mm | 29% | 9.3 kph |
| March | 6° / 14.4° | 49% | 150 mm | 30% | 8.6 kph |
| April | 8.6° / 18.1° | 41% | 103 mm | 35% | 7.8 kph |
| May | 11.5° / 22.4° | 31% | 67 mm | 44% | 7.2 kph |
| June☀ | 15.2° / 27.6° | 22% | 41 mm | 57% | 7 kph |
| July | 17.8° / 32.2° | 9% | 15 mm | 75% | 6.9 kph |
| August☀ | 17.6° / 31.9° | 8% | 15 mm | 77% | 6.9 kph |
| September☀ | 14.9° / 27.7° | 19% | 45 mm | 65% | 7.1 kph |
| October | 9.8° / 19.3° | 37% | 122 mm | 45% | 8 kph |
| November | 5.2° / 10.9° | 54% | 217 mm | 30% | 9.4 kph |
| December | 1.8° / 6.4° | 52% | 228 mm | 25% | 10 kph |
Feels-like temperatures from long-term historical data; ☀ marks the most comfortable months (mild temperatures, low rain).
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