Average Temperatures for Washington in May

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Average temperatures for May 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 May temperatures
High °F Low °F Place High °C Low °C
61 46 Aberdeen 16   8
63 42 Clearwater 17   6
63 43 Forks 17   6
62 43 Friday Harbor, San Juan Island 17   6
60 46 Grayland 16   8
59 46 Long Beach 15   8
59 48 Port Angeles 15   9

San Juan Islands, Puget Sound & South

Average daily temperatures in May
High °F Low °F Place High °C Low °C
64 48 Anacortes 18   9
62 46 Bellingham 17   8
65 46 Bremerton 18   8
65 46 Everett 18   8
67 45 Longview 20   7
63 45 Olga, Orcas Island 17   7
65 43 Olympia 19   6
63 47 Port Townsend 17   8
66 49 Seattle 19   9
66 48 Tacoma 19   9
67 45 Vancouver 19   7

Cascade Mountains

May temperatures: daily averages
High °F Low °F Place High °C Low °C
63 42 Baker Lake Dam 17   6
65 44 Baring 19   6
70 44 Darrington 21   7
67 39 Mt Adams Ranger Station 20   4
49 32 Mt Rainier Paradise Ranger Station 10   0
61 43 Mud Mountain Lake Dam 16   6
64 44 Ross Dam 18   7
53 37 Stampede Pass 12   3

Eastern Washington State

Average May temperatures
High °F Low °F Place High °C Low °C
67 41 Boundary Dam 19   5
70 48 Chelan 21   9
70 45 Coulee Dam 21   7
75 50 Kennewick 24 10
71 41 Leavenworth 22   5
65 42 Pullman 18   5
66 44 Spokane 19   7
70 48 Walla Walla 21   9
73 45 Wenatchee 23   7
71 40 Winthrop 22   4
72 42 Yakima 22   6
Reference

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

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