Average Temperatures for Montana in May





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

You can jump to a separate table for each region of the state: Northwestern, Southwestern, South - Central and Eastern Montana.

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.

Northwestern Montana

Average May temperatures
High °F Low °F Place High °C Low °C
62 37 Cut Bank 17 3
56 34 East Glacier Park 13 1
59 33 Gibson Reservoir Dam 15 0
65 38 Kalispell 18 3
73 39 Libby 23 4
66 40 Missoula 19 4
63 32 Polebridge 17 0
66 41 Polson 19 5
62 38 Rogers Pass 17 4
65 34 Seeley Lake 18 1
64 39 West Glacier 18 4
64 39 Whitefish 18 4

Southwestern Montana

Average daily temperatures in May
High °F Low °F Place High °C Low °C
64 36 Anaconda 18 2
63 39 Bozeman 17 4
61 34 Butte 16 1
62 34 Deer Lodge 17 1
64 36 Dillon 18 2
67 39 Gardiner 19 4
58 32 Hebgen Lake Dam 15 0
66 42 Helena 19 5
64 33 Sula 18 1
64 37 Virginia City 18 3
59 29 West Yellowstone 15 -2

South - Central Montana

May temperatures: daily averages
High °F Low °F Place High °C Low °C
68 44 Bighorn Lake, Yellowtail Dam 20 7
67 44 Billings 19 7
54 28 Cooke City 12 -2
57 35 Mystic Lake 14 2
62 37 Red Lodge 17 3

Eastern Montana

Average May temperatures
High °F Low °F Place High °C Low °C
71 40 Culbertson 22 5
69 40 Elwell Lake, Tiber Dam 20 4
71 44 Fort Peck Lake Dam 22 7
68 43 Glasgow 20 6
69 45 Glendive 21 7
65 38 Great Falls 18 4
68 40 Havre City 20 5
63 37 Lewistown 17 3
68 43 Miles City 20 6
Reference

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

Montana Temperatures
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