Average Temperatures for Washington in September

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Average temperatures for September 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 September temperatures
High °F Low °F Place High °C Low °C
69 51 Aberdeen 20 10
70 46 Clearwater 21   8
70 47 Forks 21   9
67 46 Friday Harbor, San Juan Island 19   8
67 49 Grayland 19   9
66 48 Long Beach 19   9
64 51 Port Angeles 18 11

San Juan Islands, Puget Sound & South

Average daily temperatures in September
High °F Low °F Place High °C Low °C
69 51 Anacortes 20 10
67 48 Bellingham 19   9
71 50 Bremerton 22 10
70 49 Everett 21   9
74 50 Longview 24 10
67 48 Olga, Orcas Island 19   9
72 46 Olympia 22   8
68 51 Port Townsend 20 10
71 53 Seattle 22 12
71 52 Tacoma 22 11
75 48 Vancouver 24   9

Cascade Mountains

September temperatures: daily averages
High °F Low °F Place High °C Low °C
69 47 Baker Lake Dam 21   8
71 48 Baring 22   9
75 46 Darrington 24   8
75 41 Mt Adams Ranger Station 24   5
58 40 Mt Rainier Paradise Ranger Station 15   4
69 47 Mud Mountain Lake Dam 21   9
70 50 Ross Dam 21 10
62 45 Stampede Pass 16   7

Eastern Washington State

Average September temperatures
High °F Low °F Place High °C Low °C
72 42 Boundary Dam 22   6
76 51 Chelan 24 11
77 49 Coulee Dam 25 10
80 52 Kennewick 27 11
79 43 Leavenworth 26   6
74 44 Pullman 23   7
73 47 Spokane 23   9
78 53 Walla Walla 26 11
79 46 Wenatchee 26   8
78 41 Winthrop 25   5
78 44 Yakima 26   6
Reference

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

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