Portland Weather by Month
Twelve months of Portland, United States weather — averages from 2006–2025.
Portland's warmest month is August (average high 28.2°C (82.8°F)) and the coolest is December (7.5°C (45.5°F)). The most rain falls in December (about 207 mm), and July is the driest (about 9 mm). July is the sunniest, with about 13.3 hours of sunshine a day.
Best months to visit Portland
Ranked within Portland's own year by temperature comfort, rainy days and sunshine — historical averages, not a forecast.
Portland month by month
January
PoorHigh 8.1°C (46.6°F)
Low 1.8°C (35.2°F)
- Rainfall
- 175 mm (6.9 in)
- Rainy days
- 17 rainy days
- Sunshine
- 4.5 h sunshine / day
February
PoorHigh 9.2°C (48.6°F)
Low 1.8°C (35.2°F)
- Rainfall
- 134 mm (5.3 in)
- Rainy days
- 16 rainy days
- Sunshine
- 5.6 h sunshine / day
March
PoorHigh 11.8°C (53.2°F)
Low 3.3°C (37.9°F)
- Rainfall
- 153 mm (6 in)
- Rainy days
- 19 rainy days
- Sunshine
- 7.2 h sunshine / day
April
GoodHigh 14.7°C (58.5°F)
Low 5.2°C (41.4°F)
- Rainfall
- 111 mm (4.4 in)
- Rainy days
- 15 rainy days
- Sunshine
- 9.3 h sunshine / day
May
GoodHigh 19°C (66.2°F)
Low 8.6°C (47.5°F)
- Rainfall
- 75 mm (3 in)
- Rainy days
- 11 rainy days
- Sunshine
- 10.4 h sunshine / day
June
GreatHigh 22.5°C (72.5°F)
Low 11.6°C (52.9°F)
- Rainfall
- 50 mm (2 in)
- Rainy days
- 8 rainy days
- Sunshine
- 11.6 h sunshine / day
July
GreatHigh 27.9°C (82.2°F)
Low 14.3°C (57.7°F)
- Rainfall
- 9 mm (0.4 in)
- Rainy days
- 2 rainy days
- Sunshine
- 13.3 h sunshine / day
August
GreatHigh 28.2°C (82.8°F)
Low 14.9°C (58.8°F)
- Rainfall
- 13 mm (0.5 in)
- Rainy days
- 3 rainy days
- Sunshine
- 12.1 h sunshine / day
September
GreatHigh 24.2°C (75.6°F)
Low 12.5°C (54.5°F)
- Rainfall
- 55 mm (2.1 in)
- Rainy days
- 7 rainy days
- Sunshine
- 10.2 h sunshine / day
October
GoodHigh 16.9°C (62.4°F)
Low 8.3°C (46.9°F)
- Rainfall
- 123 mm (4.8 in)
- Rainy days
- 12 rainy days
- Sunshine
- 7.2 h sunshine / day
November
PoorHigh 10.9°C (51.6°F)
Low 4.5°C (40.1°F)
- Rainfall
- 190 mm (7.5 in)
- Rainy days
- 18 rainy days
- Sunshine
- 5 h sunshine / day
December
PoorHigh 7.5°C (45.5°F)
Low 1.8°C (35.2°F)
- Rainfall
- 207 mm (8.1 in)
- Rainy days
- 18 rainy days
- Sunshine
- 4 h sunshine / day
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Based on 20 years of historical weather data (2006–2025) from Open-Meteo. Monthly averages, not a forecast.