Average Temperatures for Oregon in September





Average temperatures for September 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 September temperatures
High °F Low °F Place High °C Low °C
68 51 Astoria 20 10
67 52 Brookings 19 11
69 52 Gold Beach 20 11
66 50 Honeyman State Park 19 10
64 49 Newport 18 9
67 51 North Bend 19 11
67 51 Port Orford 20 11
67 50 Seaside 19 10
68 47 Tillamook 20 8

Willamette Valley

Average daily temperatures in September
High °F Low °F Place High °C Low °C
78 48 Corvallis 25 9
78 48 Eugene 26 9
79 51 Lebanon 26 10
76 53 Portland 24 12
78 51 Salem 25 10

Cascade Mountains

September temperatures: daily averages
High °F Low °F Place High °C Low °C
63 37 Crater Lake Park 17 3
74 53 Detroit Lake Dam 23 12
64 45 Government Camp 18 7
84 48 Grants Pass 29 9
72 40 Howard Prairie Lake Dam 22 4
78 39 Klamath Falls 25 4
76 40 Lakeview 25 5
76 45 McKenzie Bridge 25 7
84 51 Medford 29 11
83 50 Roseburg 28 10
73 48 Three Lynx 23 9
76 46 Toketee Falls 24 8
75 38 Wickiup Reservoir Dam 24 4

Central Oregon

Average September temperatures
High °F Low °F Place High °C Low °C
76 41 Bend 24 5
76 47 Hood River 24 9
77 38 Madras 25 3
81 49 The Dalles 27 10

Eastern Oregon

Average September temperatures
High °F Low °F Place High °C Low °C
74 39 Hart Mountain Antelope Refuge 23 4
77 48 Heppner 25 9
77 45 La Grande 25 7
83 45 Lake Owyhee Dam 28 7
75 40 Malheur National Wildlife Refuge 24 4
81 47 Ontario 27 9
80 47 Pendleton 27 8
73 27 Seneca 23 -3
81 40 Summer Lake 27 4
Reference

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

Oregon Temperatures
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