Seattle, WA Climate

Summary Graph

The summary climate graph for Seattle, WA shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.

Graph of average and extreme temperature ranges by day for Seattle, WA.


The warmest month in Seattle Tacoma International, Seattle, Washington is July with an average high temperature of 77.0°F. The hottest day on record was July 30 2009 when the temperature hit 102.9°F. During January the overnight temperature drops to an average of 34.7°F with the lowest temperature of 0.3°F being recorded on January 31 1950.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

30 Jul 2009102.9°F
21 Jul 1994100°F
9 Aug 196099.3°F
10 Aug 198199°F
16 Aug 196798.4°F

The warmest months on average were:

August 196785.9°F
July 195884.3°F
July 200983.4°F
July 198583°F
August 198682.2°F

The coldest days on record are:

31 Jan 19500.3°F
1 Feb 19501.4°F
15 Nov 19556.4°F
30 Dec 19686.4°F
5 Feb 19896.8°F

The coldest months on average were:

January 195018.9°F
January 194922.9°F
February 198926.7°F
January 195727.4°F
December 199028.9°F


The wettest month by average rainfall in Seattle, WA is November with an average of 6.2 inches of rain falling on 19 to 20 days.Although in December it typically rains on more days with 5.7 inches falling in 19 to 20 days. The driest month in Seattle, WA is July with an average of 0.8 inches of rain falling on 7 to 8 days.

Wettest Days

The wettest days on record are:

21 October 20034.6 inches
26 October 19861.5 inches
10 October 20101.5 inches
15 October 20121.5 inches
29 October 19821.5 inches

Wettest Months

The wettest months on record are:

May 197319.2 inches
September 197818.4 inches
November 200615.6 inches
January 195313.1 inches
February 197312.6 inches

Driest Months

The driest months on record are:

July 19600 inches
July 19580 inches
August 20120 inches
July 19670 inches
August 19740 inches