Average August Temperatures for Montana

Average temperatures for August 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 August temperatures
High °F	Low °F	Place	High °C	Low °C
80	48	Cut Bank	27	9
74	44	East Glacier Park	23	7
78	43	Gibson Reservoir Dam	26	6
82	46	Kalispell	28	8
90	47	Libby	32	9
84	50	Missoula	29	10
82	38	Polebridge	28	3
82	53	Polson	28	11
81	49	Rogers Pass	27	9
83	43	Seeley Lake	28	6
79	48	West Glacier	26	9
80	48	Whitefish	27	9

Southwestern Montana

Average daily temperatures in August
High °F	Low °F	Place	High °C	Low °C
82	47	Anaconda	28	9
81	50	Bozeman	27	10
80	44	Butte	27	7
79	42	Deer Lodge	26	6
81	46	Dillon	27	8
86	52	Gardiner	30	11
78	43	Hebgen Lake Dam	26	6
85	53	Helena	29	12
81	40	Sula	27	5
81	49	Virginia City	27	9
78	36	West Yellowstone	26	2

South - Central Montana

August temperatures: daily averages
High °F	Low °F	Place	High °C	Low °C
87	57	Bighorn Lake, Yellowtail Dam	31	14
86	58	Billings	30	14
71	38	Cooke City	22	3
74	50	Mystic Lake	23	10
81	49	Red Lodge	27	9

Eastern Montana

Average August temperatures
High °F	Low °F	Place	High °C	Low °C
87	54	Culbertson	30	12
85	51	Elwell Lake, Tiber Dam	29	11
88	57	Fort Peck Lake Dam	31	14
85	57	Glasgow	29	14
87	58	Glendive	31	14
83	50	Great Falls	28	10
85	52	Havre City	29	11
81	50	Lewistown	27	10
87	58	Miles City	31	14

Average Temperatures for Montana in August

Northwestern Montana

Southwestern Montana

South - Central Montana

Eastern Montana

Reference

More Montana Weather Information