Pacific Northwest weather by month
Pacific Northwest runs from an average daily high of 47°F in December to 78°F in August, with overnight lows between 37°F (December) and 57°F (August).
November is the wettest month (6.3 inches) and July the driest (0.6 inches); about 39 inches fall in a normal year.
The best months for most visitors are Jun-Sep.
Month by month in Pacific Northwest
| Month | Average high | Average low | Rain (in) |
|---|---|---|---|
| January | 48°F | 38°F | 5.8 |
| February | 50°F | 38°F | 3.8 |
| March | 54°F | 40°F | 4.2 |
| April | 59°F | 43°F | 3.2 |
| May | 66°F | 49°F | 1.9 |
| June best | 71°F | 53°F | 1.4 |
| July best | 77°F | 57°F | 0.6 |
| August best | 78°F | 57°F | 1.0 |
| September best | 72°F | 54°F | 1.6 |
| October | 60°F | 47°F | 3.9 |
| November | 52°F | 41°F | 6.3 |
| December | 47°F | 37°F | 5.7 |
The numbers are from NOAA's station at Seattle-Tacoma Airport (USW00024233). Climate normals 1991-2020: long-run averages, not a forecast.
Questions about Pacific Northwest weather
What is the best time to visit Pacific Northwest?
The best months for most visitors are Jun-Sep. Dry season: Jun–Sep. Rainy season: Oct–Mar. Mountain snow: Nov–May.
What is the hottest and coldest month in Pacific Northwest?
August is the hottest (average high 78°F) and December the coolest (average low 37°F).
When does it rain the most in Pacific Northwest?
November is the wettest month (6.3 inches) and July the driest (0.6 inches).
Does it snow in Pacific Northwest?
The station does not record snowfall as a normal; check the forecast for mountain areas.
Where do these weather numbers come from?
The numbers are from NOAA's station at Seattle-Tacoma Airport (USW00024233). They are 1991-2020 climate normals (long-run averages), not a forecast. For today's weather use the National Weather Service forecast.