Average Temperatures for Washington in August

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Average temperatures for August at cities, towns, parks and lakes throughout Washington are listed below in degrees Fahrenheit and Celsius.

The tables give the normals for maximum and minimum monthly temperatures based on weather data collected from 1981 to 2010.

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 August temperatures
High °F Low °F Place High °C Low °C
69 54 Aberdeen 21 12
72 49 Clearwater 22 10
73 51 Forks 23 10
72 48 Friday Harbor, San Juan Island 22   9
67 52 Grayland 19 11
66 52 Long Beach 19 11
67 54 Port Angeles 20 12

San Juan Islands, Puget Sound & South

Average daily temperatures in August
High °F Low °F Place High °C Low °C
74 54 Anacortes 23 12
72 53 Bellingham 22 12
77 55 Bremerton 25 13
76 54 Everett 24 12
79 53 Longview 26 12
71 51 Olga, Orcas Island 22 10
78 51 Olympia 25 10
73 53 Port Townsend 23 12
76 57 Seattle 25 14
77 56 Tacoma 25 13
79 53 Vancouver 26 11

Cascade Mountains

August temperatures: daily averages
High °F Low °F Place High °C Low °C
75 51 Baker Lake Dam 24 11
76 52 Baring 25 11
81 53 Darrington 27 11
83 48 Mt Adams Ranger Station 29   9
65 44 Mt Rainier Paradise Ranger Station 18   7
74 52 Mud Mountain Lake Dam 23 11
78 55 Ross Dam 26 13
68 49 Stampede Pass 20 10

Eastern Washington State

Average August temperatures
High °F Low °F Place High °C Low °C
83 49 Boundary Dam 29 10
85 60 Chelan 30 16
87 57 Coulee Dam 30 14
89 61 Kennewick 32 16
88 51 Leavenworth 31 11
84 50 Pullman 29 10
83 56 Spokane 28 13
88 60 Walla Walla 31 16
88 56 Wenatchee 31 13
86 49 Winthrop 30 10
87 52 Yakima 30 11
Reference

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

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