Average Temperatures for Washington in May





Average temperatures for May 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 May temperatures
High °F Low °F Place High °C Low °C
61 47 Aberdeen 16 8
64 43 Clearwater 18 6
65 43 Forks 18 6
64 44 Friday Harbor, San Juan Island 18 7
69 39 Grayland 20 4
59 45 Long Beach 15 7
60 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
66 48 Anacortes 19 9
64 47 Bellingham 18 8
66 47 Bremerton 19 8
67 44 Centralia 19 7
63 48 Everett 17 9
69 45 Longview 20 7
65 47 Mount Vernon 18 8
73 49 Oak Harbor, Whidbey Island 23 10
62 48 Olga, Orcas Island 16 9
66 43 Olympia 19 6
63 47 Port Townsend 17 8
66 49 Seattle 19 9
67 44 Shelton 19 7
67 49 Tacoma 19 10
66 44 Vancouver 19 7

Cascade Mountains

May temperatures: daily averages
High °F Low °F Place High °C Low °C
64 42 Baker Lake Dam 18 6
66 44 Baring 19 7
67 44 Darrington 19 7
68 40 Mt Adams Ranger Station 20 4
48 33 Mt Rainier Paradise Ranger Station 9 1
63 44 Mud Mountain Lake Dam 17 6
65 45 Ross Dam 18 7
53 38 Stampede Pass 12 4

Eastern Washington State

Average May temperatures
High °F Low °F Place High °C Low °C
67 41 Boundary Dam 20 5
72 46 Chelan 22 8
71 46 Coulee Dam 22 8
75 50 Kennewick 24 10
71 40 Leavenworth 22 4
74 45 Moses Lake 23 7
66 42 Pullman 19 6
67 45 Spokane 20 7
71 49 Walla Walla 22 10
62 48 Wenatchee 17 9
71 40 Winthrop 22 4
74 44 Yakima 23 6
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Washington Temperatures
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