S
M
T
W
T
F
S
26
81°
61°
27
83°
63°
28
81°
65°
29
77°
62°
30
82°
56°
31
83°
54°
1
85°
69°
2
79°
68°
3
80°
66°
4
83°
68°
5
82°
67°
6
83°
68°
7
84°
67°
8
83°
66°
9
82°
67°
10
83°
65°
11
80°
65°
12
77°
63°
13
79°
63°
14
78°
62°
15
78°
59°
16
77°
58°
17
86°
66°
18
85°
65°
19
86°
66°
20
85°
64°
21
83°
61°
22
85°
65°
23
86°
66°
24
87°
66°
25
85°
65°
26
83°
65°
27
82°
64°
28
84°
64°
29
81°
63°
30
82°
64°
31
82°
63°
1
84°
61°
2
77°
56°
3
76°
56°
4
76°
57°
5
78°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Montana
Montana's August 2026 forecast shows daily high temperatures ranging from 76° to 87°, with overnight lows between 56° and 69°. The average high for August is 82° with an average low of 64°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Montana. See also: September | October | November.
