Average Temperatures for Wyoming in September





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

You can jump to a separate table for each region of the state: Northwest, Southwest, North - Central, Northeast and Southeast Wyoming.

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.

Northwest Wyoming

Average September temperatures
High °F Low °F Place High °C Low °C
69 40 Alta 20 4
72 47 Cody 22 8
68 33 Jackson 20 0
71 34 Moose 22 1
66 34 Moran 19 1
61 34 Yellowstone Lake 16 1
69 39 Yellowstone Park, Mammoth 20 4
65 30 Yellowstone Park, Old Faithful 18 -1
66 28 Yellowstone Park, South Entrance 19 -2

Southwest Wyoming

Average daily temperatures in September
High °F Low °F Place High °C Low °C
71 39 Evanston 22 4
71 34 Fontenelle Reservoir Dam 22 1
72 32 Fossil Butte Monument 22 0
72 32 Kemmerer 22 0
71 44 Rock Springs 22 7

North - Central Wyoming

September temperatures: daily averages
High °F Low °F Place High °C Low °C
77 47 Boysen Reservoir Dam 25 8
61 33 Burgess Junction 16 1
75 45 Lander 24 7
74 43 Riverton 24 6
67 31 South Pass City 20 -1
73 38 Ten Sleep 23 3
80 46 Thermopolis 27 8
76 42 Worland 25 6

Northeast Wyoming

Average September temperatures
High °F Low °F Place High °C Low °C
72 42 Buffalo 22 5
75 42 Devils Tower 24 6
75 46 Gillette 24 8
76 43 Sheridan 24 6
71 45 Sundance 22 7

Southeast Wyoming

Average September temperatures
High °F Low °F Place High °C Low °C
76 42 Casper 24 6
68 39 Centennial 20 4
73 46 Cheyenne 23 8
76 43 Douglas 24 6
72 43 Laramie 22 6
74 45 Muddy Gap 23 7
72 41 Rawlins 22 5
79 43 Torrington 26 6
Reference

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

Wyoming Temperatures
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