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 Boeing Field King Co International, Seattle, Washington is July with an average high temperature of 78.0°F. The hottest day on record was July 30 2009 when the temperature hit 105.1°F. During January the overnight temperature drops to an average of 36.1°F with the lowest temperature of 1.0°F being recorded on January 26 2011.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

30 Jul 2009105.1°F
9 Aug 1960100.4°F
10 Aug 1981100°F
9 Jun 195599.3°F
24 Jul 199199°F

The warmest months on average were:

July 195886.4°F
July 198585.2°F
July 200983.4°F
July 196083.2°F
August 199782.8°F

The coldest days on record are:

26 Jan 20111°F
31 Jan 19503.4°F
1 Feb 19504.3°F
21 Dec 19905.2°F
23 Nov 19858.2°F

The coldest months on average were:

January 195021.4°F
January 194924.8°F
January 195727.9°F
January 197929.2°F
February 198929.8°F


The wettest month by average rainfall in Seattle, WA is November with an average of 3.2 inches of rain falling on 15 to 16 days.Although in December it typically rains on more days with 2.9 inches falling in 16 to 17 days. The driest month in Seattle, WA is July with an average of 0.3 inches of rain falling on 6 to 6 days.

Wettest Days

The wettest days on record are:

1 July 19540.8 inches
5 July 19610.7 inches
21 July 20120.7 inches
19 July 19500.5 inches
8 July 19530.5 inches

Wettest Months

The wettest months on record are:

November 200614.5 inches
January 200611.6 inches
January 195311.6 inches
December 20109.9 inches
December 20079.6 inches

Driest Months

The driest months on record are:

November 19430 inches
December 19430 inches
January 19440 inches
February 19440 inches
March 19440 inches