Average Temperatures for Montana in September

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Average temperatures for September at cities, towns, parks and lakes throughout Montana 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: Northwestern, Southwestern, South - Central and Eastern Montana.

Northwestern Montana

Average September temperatures
High °F Low °F Place High °C Low °C
68 40 Cut Bank 20  4
64 37 East Glacier Park 18  3
72 45 Flathead Lake, Polson 22  7
66 38 Gibson Reservoir Dam 19  3
70 38 Kalispell 21  4
76 40 Libby 24  5
73 42 Missoula 23  5
69 31 Polebridge 20  0
69 40 Rogers Pass 21  4
73 36 Seeley Lake 23  2
68 39 West Glacier 20  4
68 39 Whitefish 20  4

Southwestern Montana

Average daily temperatures in September
High °F Low °F Place High °C Low °C
72 41 Bozeman 22  5
68 36 Butte 20  2
70 34 Deer Lodge 21  1
75 43 Gardiner 24  6
67 36 Hebgen Lake Dam 20  2
73 43 Helena 23  6
72 33 Sula 22  1
71 40 Virginia City 21  4
66 30 West Yellowstone 19 -1

South - Central Montana

September temperatures: daily averages
High °F Low °F Place High °C Low °C
75 46 Bighorn Lake, Yellowtail Dam 24  8
73 48 Billings 23  9
63 31 Cooke City 17 -1
66 43 Mystic Lake 19  6
69 41 Red Lodge 20  5

Eastern Montana

Average September temperatures
High °F Low °F Place High °C Low °C
75 43 Culbertson 24  6
74 42 Elwell Lake, Tiber Dam 23  5
76 46 Fort Peck Lake Dam 24  8
72 45 Glasgow 22  7
76 47 Glendive 24  8
70 42 Great Falls 21  6
71 42 Havre City 22  5
69 41 Lewistown 21  5
74 46 Miles City 23  8
Reference

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

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