Average Rainfall for Washington in August

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The tables below give monthly averages for rainfall during August at cities, towns and parks in Washington.

Each place has a total for the amount of precipitation it usually receives this month. Most sites also have 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 1981 to 2010 for the NOAA National Climatic Data Center.

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 38
  7 Clearwater 2.7 67
  9 Forks 2.6 66
  – Friday Harbor, San Juan Island 0.9 24
  9 Grayland 1.6 42
11 Long Beach 1.7 42
  5 Port Angeles 0.7 18

San Juan Islands, Puget Sound & South

August averages for total rainfall
Days Place Inches Millimetres
  5 Anacortes 1.0 26
  7 Bellingham 1.2 31
  6 Bremerton 1.0 26
  6 Everett 1.2 29
  6 Longview 1.2 29
  4 Olga, Orcas Island 1.1 27
  5 Olympia 0.9 24
  5 Port Townsend 0.7 17
  5 Seattle 0.9 24
  4 Tacoma 0.8 21
  4 Vancouver 0.7 19

Cascade Mountains

Average amount of rain in August
Days Place Inches Millimetres
  7 Baker Lake Dam 2.1 54
  7 Baring 2.0 50
  – Darrington 1.7 43
  – Mt Adams Ranger Station 0.7 17
  7 Mt Rainier Paradise Ranger Station 2.0 50
  8 Mud Mountain Lake Dam 1.7 44
  6 Ross Dam 1.3 32
  7 Stampede Pass 1.5 39

Eastern Washington State

Precipitation totals for August
Days Place Inches Millimetres
  7 Boundary Dam 1.2 30
  2 Chelan 0.3   8
  3 Coulee Dam 0.3   7
  2 Kennewick 0.2   5
  2 Leavenworth 0.5 12
  4 Pullman 0.7 17
  4 Spokane 0.6 15
  3 Walla Walla 0.6 14
  2 Wenatchee 0.2   6
  4 Winthrop 0.5 14
  2 Yakima 0.3   7
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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