Seattle weather by month

Seattle 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.

Snow is a real part of the year here: about 6 inches in a normal winter, most in February.

By a simple rule (average highs of 65-88°F, lows of 40°F or more and rain at or under the yearly average), the comfortable months for Seattle day trips are May-Sep.

Month by month in Seattle

Month	Average high	Average low	Rain (in)	Snow (in)	Day trips open
January	48°F	38°F	5.8	1.8	89 of 113
February	50°F	38°F	3.8	2.2	89 of 113
March	54°F	40°F	4.2	0.4	88 of 113
April	59°F	43°F	3.2	0.0	91 of 113
May best	66°F	49°F	1.9	0.0	95 of 113
June best	71°F	53°F	1.4	0.0	98 of 113
July best	77°F	57°F	0.6	0.0	110 of 113
August best	78°F	57°F	1.0	0.0	110 of 113
September best	72°F	54°F	1.6	0.0	109 of 113
October	60°F	47°F	3.9	0.0	104 of 113
November	52°F	41°F	6.3	0.2	89 of 113
December	47°F	37°F	5.7	1.7	90 of 113

The numbers are from NOAA's station at Seattle Tacoma Intl Airport, Wa (USW00024233). Climate normals 1991-2020: long-run averages, not a forecast. "Day trips open" counts the places within 3 hours that are open or in season on the 15th, from our own place data.

Questions about Seattle weather

What is the best time to visit Seattle?

By a simple rule (average highs of 65-88°F, lows of 40°F or more and rain at or under the yearly average), the comfortable months for Seattle day trips are May-Sep.

What is the hottest and coldest month in Seattle?

August is the hottest (average high 78°F) and December the coolest (average low 37°F).

When does it rain the most in Seattle?

November is the wettest month (6.3 inches) and July the driest (0.6 inches).

Does it snow in Seattle?

Yes: about 6 inches in a normal year, most in February.

Where do these weather numbers come from?

The numbers are from NOAA's station at Seattle Tacoma Intl Airport, Wa (USW00024233). They are 1991-2020 climate normals (long-run averages), not a forecast. For today's weather use the National Weather Service forecast.