S
M
T
W
T
F
S
26
86°
64°
27
86°
65°
28
85°
65°
29
83°
64°
30
81°
64°
31
86°
65°
1
85°
65°
2
86°
63°
3
86°
63°
4
87°
64°
5
86°
64°
6
81°
63°
7
83°
59°
8
80°
57°
9
81°
58°
10
80°
57°
11
80°
63°
12
85°
63°
13
86°
62°
14
86°
57°
15
80°
56°
16
80°
61°
17
81°
63°
18
80°
57°
19
81°
56°
20
81°
56°
21
83°
57°
22
84°
56°
23
84°
55°
24
83°
55°
25
83°
57°
26
84°
60°
27
85°
61°
28
83°
60°
29
85°
62°
30
85°
58°
31
83°
53°
1
79°
52°
2
77°
53°
3
77°
52°
4
78°
54°
5
77°
52°
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 77° to 87°, with overnight lows between 52° and 65°. The average high for August is 83° with an average low of 59°. 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.
