Average September Temperatures for Wyoming

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

Average Temperatures for Wyoming in September

Northwest Wyoming

Southwest Wyoming

North - Central Wyoming

Northeast Wyoming

Southeast Wyoming

Reference

More Wyoming Weather Information