Best time to visit Portland OR, United States
Based on 2020–2024 of daily weather data, the best months to visit Portland OR are July, August, September — when temperatures are comfortable, rainfall is low, and sunshine is plentiful.
Months ranked by travel comfort
| Rank | Month | High | Low | Precip | Rainy days | Sun | Score |
|---|---|---|---|---|---|---|---|
| 1 ★ | July | 29.2° | 14.8° | 25.6 mm | 24 | 13.5 h | 98 |
| 2 ★ | August | 29.2° | 15.3° | 65.8 mm | 33 | 11.9 h | 97 |
| 3 ★ | September | 25.1° | 12.9° | 325.9 mm | 57 | 10 h | 88 |
| 4 | June | 23.3° | 11.6° | 388 mm | 64 | 11.7 h | 86 |
| 5 | May | 18.9° | 8.4° | 488.1 mm | 94 | 10.1 h | 75 |
| 6 | October | 17.7° | 8.7° | 559 mm | 74 | 7 h | 67 |
| 7 | April | 14.7° | 4.6° | 545.9 mm | 92 | 8.9 h | 63 |
| 8 | March | 11.5° | 2.6° | 606.8 mm | 100 | 7.1 h | 51 |
| 9 | February | 8.7° | 1.6° | 638.5 mm | 102 | 5.4 h | 42 |
| 10 | November | 10.5° | 4.3° | 1103.8 mm | 103 | 4.8 h | 35 |
| 11 | January | 8.2° | 2.4° | 1189.9 mm | 119 | 3.6 h | 28 |
| 12 | December | 7.9° | 2.6° | 1236.1 mm | 120 | 3.5 h | 27 |
Score (0–100) blends ideal-temperature comfort (50%), low-rainfall (30%), and sunshine (20%). Higher is better for a typical sightseeing trip.
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