Average August Temperatures for Washington

Average temperatures for August at cities and other locations throughout Washington are listed below in degrees Fahrenheit and Celsius.

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.

The tables give the normals for maximum and minimum temperatures based on weather data collected from 1991 to 2020 by the US National Centers for Environmental Information.

Olympic Peninsula & West Coast

Average August temperatures
High °F	Low °F	Place	High °C	Low °C
69	54	Aberdeen	21	12
73	50	Clearwater	23	10
74	51	Forks	23	10
73	50	Friday Harbor, San Juan Island	23	10
86	49	Grayland	30	10
67	52	Long Beach	19	11
67	55	Port Angeles	20	13

San Juan Islands, Puget Sound & South

Average daily temperatures in August
High °F	Low °F	Place	High °C	Low °C
75	54	Anacortes	24	12
73	55	Bellingham	23	13
77	55	Bremerton	25	13
78	53	Centralia	26	12
73	55	Everett	23	13
80	53	Longview	27	12
75	53	Mount Vernon	24	12
88	61	Oak Harbor, Whidbey Island	31	16
69	54	Olga, Orcas Island	21	12
78	51	Olympia	26	10
73	54	Port Townsend	23	12
78	57	Seattle	25	14
79	52	Shelton	26	11
77	57	Tacoma	25	14
79	52	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
77	52	Baring	25	11
79	54	Darrington	26	12
84	49	Mt Adams Ranger Station	29	10
64	45	Mt Rainier Paradise Ranger Station	18	7
76	52	Mud Mountain Lake Dam	24	11
79	56	Ross Dam	26	13
69	51	Stampede Pass	21	11

Eastern Washington State

Average August temperatures
High °F	Low °F	Place	High °C	Low °C
85	50	Boundary Dam	29	10
87	58	Chelan	31	15
87	58	Coulee Dam	31	15
90	61	Kennewick	32	16
87	50	Leavenworth	31	10
88	56	Moses Lake	31	13
85	50	Pullman	30	10
84	57	Spokane	29	14
89	62	Walla Walla	31	17
70	54	Wenatchee	21	12
86	49	Winthrop	30	10
89	53	Yakima	31	12

Average Temperatures for Washington in August

Olympic Peninsula & West Coast

San Juan Islands, Puget Sound & South

Cascade Mountains

Eastern Washington State

Reference

More Washington Weather Information