Average Temperatures for Oregon in May





Average temperatures for May at cities, towns, parks and lakes throughout Oregon are listed below in degrees Fahrenheit and Celsius.

You can jump to a separate table for each region of the state: Oregon Coast, Willamette Valley, Cascade Mountains, Central Oregon and Eastern Oregon.

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.

Oregon Coast

Average May temperatures
High °F Low °F Place High °C Low °C
61 46 Astoria 16 8
62 48 Brookings 17 9
62 47 Gold Beach 17 8
60 45 Honeyman State Park 16 7
58 46 Newport 15 8
61 48 North Bend 16 9
61 48 Port Orford 16 9
60 46 Seaside 15 8
61 44 Tillamook 16 7

Willamette Valley

Average daily temperatures in May
High °F Low °F Place High °C Low °C
68 45 Corvallis 20 7
68 44 Eugene 20 7
69 47 Lebanon 21 9
69 48 Portland 21 9
69 46 Salem 21 8

Cascade Mountains

May temperatures: daily averages
High °F Low °F Place High °C Low °C
49 29 Crater Lake Park 9 -2
65 46 Detroit Lake Dam 18 8
54 36 Government Camp 12 2
74 46 Grants Pass 23 8
60 36 Howard Prairie Lake Dam 16 2
67 36 Klamath Falls 20 2
65 38 Lakeview 18 3
71 43 McKenzie Bridge 21 6
74 47 Medford 23 8
73 47 Roseburg 23 8
64 44 Three Lynx 18 7
70 43 Toketee Falls 21 6
63 36 Wickiup Reservoir Dam 17 2

Central Oregon

Average May temperatures
High °F Low °F Place High °C Low °C
66 37 Bend 19 3
68 46 Hood River 20 8
68 36 Madras 20 2
73 47 The Dalles 23 8

Eastern Oregon

Average May temperatures
High °F Low °F Place High °C Low °C
62 35 Hart Mountain Antelope Refuge 17 2
69 45 Heppner 21 7
68 43 La Grande 20 6
75 42 Lake Owyhee Dam 24 6
68 39 Malheur National Wildlife Refuge 20 4
74 47 Ontario 23 8
73 45 Pendleton 23 7
62 32 Seneca 17 0
70 37 Summer Lake 21 3
Reference

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

Oregon Temperatures
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