Portland, OR Weather
Portland hourly forecast: next 24 hours
Today's high of 66°F (19°C) is about 9°F (5°C) below the typical September high of 75°F (24°C).
Current conditions in detail
Portland weather tomorrow (Wednesday, September 16)
Tomorrow in Portland looks sunny, with a high of 81° and an overnight low of 53°. Rain is unlikely (2% chance). Winds top out near 8 mph, and the UV index reaches 5 (moderate).
Portland 14-day forecast
About the weather in Portland
Portland runs on a dry-summer rhythm: the warmest months are also the driest. July averages 8 mm (0.3 in) while the wet season peaks in December at 8.9 inches (225 mm). Highs range from 46°F (8°C) to 84°F (29°C).
Portland weather: quick facts
- Hottest month: August - highs near 84°F (29°C)
- Coldest month: December - highs near 46°F (8°C)
- Decade extremes (2015-2024): 115°F (46°C) high · 6°F (-14°C) low
- Wettest month: December (19 rainy days) · Sunniest: July (13.2 h sun/day)
- Climate type: Mediterranean
- Annual swing: 17°C between the average warmest and coolest month · day to night: 10°C
- Snow: about 9 days a year
- Average humidity: 75%
Temperatures through the year
August is the warm end of the year, averaging 84°F (29°C) by day and 59°F (15°C) overnight. December bottoms out at 46°F (8°C) in daylight, 36°F (2°C) after dark. The wettest month is December (8.9 inches (225 mm) across 19 days) and the driest July.
Rain, sun and snow
Snow falls on roughly 9 days a year, mostly December through April. 2 months average under 20 mm of rain, the longest unbroken stretch running July through August. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 115°F (46°C) and the lowest daily minimum 6°F (-14°C).
Season by season
Spring (March through May)
Spring in Portland is crisp but comfortable, with daytime highs averaging 60°F (16°C) and nights around 43°F (6°C); rain falls on around 43 of the 90 days, plus about 3 snowy days.
Summer (June through August)
Summer in Portland sits firmly in the heat, with daytime highs averaging 81°F (27°C) and nights around 57°F (14°C); rain comes on about 13 days over the three months. Daylight is generous - around 12.4 hours of sun a day.
Fall (September through November)
Fall in Portland is crisp but comfortable, with daytime highs averaging 63°F (17°C) and nights around 47°F (8°C); rain falls on around 37 of the 90 days.
Winter (December through February)
Through winter, Portland is brisk and cold: 47°F (8°C) by day, 36°F (2°C) after dark, and rain falls on around 55 of the 90 days, plus about 6 snowy days.
Average temperatures in Portland by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 47° | 36° | 19 | 7.5 in | 4.1 h/day | 85% |
| February | 48° | 35° | 16 | 5.9 in | 5.2 h/day | 83% |
| March | 54° | 38° | 17 | 5.4 in | 7.4 h/day | 80% |
| April | 59° | 42° | 15 | 4.4 in | 8.9 h/day | 76% |
| May | 67° | 48° | 11 | 2.8 in | 10.1 h/day | 73% |
| June | 75° | 53° | 8 | 2.2 in | 12.0 h/day | 66% |
| July | 83° | 58° | 2 | 0.3 in | 13.2 h/day | 58% |
| August | 84° | 59° | 3 | 0.5 in | 12.1 h/day | 59% |
| September | 75° | 54° | 8 | 2.5 in | 9.9 h/day | 68% |
| October | 63° | 47° | 12 | 5.4 in | 7.1 h/day | 79% |
| November | 52° | 40° | 17 | 7.5 in | 5.1 h/day | 84% |
| December | 46° | 36° | 19 | 8.9 in | 3.8 h/day | 86% |