Average Rainfall for Washington in August





The tables below give monthly averages for rainfall during August at cities and other locations in Washington.

Each place has a total for the amount of precipitation it usually receives this month. There is also information on the number of days with wet weather. That includes the days when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The rainfall totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

You can jump to a separate table for each region of the state: Olympic Peninsula & West Coast, San Juan Islands & Puget Sound, Cascade Mountains and Eastern Washington.

Olympic Peninsula & West Coast

Average monthly precipitation in August
Days Place Inches Milli­metres
7 Aberdeen 1.5 39
8 Clearwater 2.7 68
9 Forks 2.8 70
8 Friday Harbor, San Juan Island 0.7 18
9 Grayland 1.7 43
11 Long Beach 1.6 41
6 Port Angeles 0.7 17

San Juan Islands, Puget Sound & South

August averages for total rainfall
Days Place Inches Milli­metres
5 Anacortes 1.4 35
6 Bellingham 1.1 29
6 Bremerton 1.1 28
5 Centralia 0.8 21
6 Everett 1.0 25
5 Longview 1.0 25
6 Oak Harbor, Whidbey Island 0.9 22
5 Olga, Orcas Island 1.0 25
5 Olympia 1.0 24
6 Port Townsend 0.5 14
5 Seattle 1.0 25
5 Shelton 1.2 31
4 Tacoma 0.8 21
4 Vancouver 0.6 16

Cascade Mountains

Average amount of rain in August
Days Place Inches Milli­metres
7 Baker Lake Dam 1.9 49
6 Baring 1.9 48
6 Ross Dam 1.2 31

Eastern Washington State

Precipitation totals for August
Days Place Inches Milli­metres
5 Boundary Dam 0.8 21
2 Chelan 0.3 8
3 Coulee Dam 0.3 8
2 Kennewick 0.2 4
2 Leavenworth 0.4 9
2 Moses Lake 0.2 4
4 Pullman 0.5 12
3 Spokane 0.5 12
3 Walla Walla 0.4 10
2 Wenatchee 0.2 5
4 Winthrop 0.5 11
2 Yakima 0.2 5
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Washington Precipitation
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