Average May Temperatures for Montana

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

Average Temperatures for Montana in May

Northwestern Montana

Southwestern Montana

South - Central Montana

Eastern Montana

Reference

More Montana Weather Information