Average Temperatures for Oregon in May

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Average temperatures for May at cities, towns, parks and lakes throughout Oregon 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: Oregon Coast, Willamette Valley, Cascade Mountains, Central Oregon and Eastern Oregon.

Oregon Coast

Average May temperatures
High °F Low °F Place High °C Low °C
60 46 Astoria 16  8
63 47 Brookings 17  8
62 47 Gold Beach 17  8
60 45 Honeyman State Park 16  7
59 46 Newport 15  8
59 47 North Bend 15  8
60 47 Port Orford 15  8
59 45 Seaside 15  7
62 44 Tillamook 17  6

Willamette Valley

Average daily temperatures in May
High °F Low °F Place High °C Low °C
67 44 Corvallis 20  7
67 44 Eugene 19  6
69 48 Portland 20  9
68 45 Salem 20  7

Cascade Mountains

May temperatures: daily averages
High °F Low °F Place High °C Low °C
49 28 Crater Lake Park 10 -2
65 44 Detroit Lake Dam 19  6
53 35 Government Camp 12  2
62 36 Howard Prairie Lake Dam 17  2
72 40 Klamath Falls 22  4
65 37 Lakeview 18  3
71 42 McKenzie Bridge 22  6
73 46 Medford 23  8
64 43 Three Lynx 18  6
68 42 Toketee Falls 20  6
63 35 Wickiup Reservoir Dam 17  2

Central Oregon

Average May temperatures
High °F Low °F Place High °C Low °C
65 36 Bend 18  2
69 45 Hood River 20  7
69 37 Madras 20  3
73 46 The Dalles 23  8

Eastern Oregon

Average May temperatures
High °F Low °F Place High °C Low °C
63 33 Hart Mountain Antelope Refuge 17  1
69 44 Heppner 20  6
67 42 La Grande 19  6
74 42 Lake Owyhee Dam 23  5
67 39 Malheur Wildlife Refuge 19  4
75 44 Ontario 24  7
70 46 Pendleton 21  8
61 33 Seneca 16  0
69 41 Summer Lake 21  5
69 40 Whitehorse Ranch 20  4
Reference

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

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