S
M
T
W
T
F
S
26
89°
53°
27
90°
54°
28
88°
53°
29
88°
58°
30
90°
59°
31
89°
59°
1
85°
57°
2
84°
56°
3
86°
57°
4
87°
58°
5
88°
58°
6
86°
57°
7
87°
58°
8
90°
58°
9
90°
59°
10
85°
57°
11
86°
58°
12
82°
57°
13
83°
56°
14
86°
57°
15
87°
56°
16
79°
56°
17
78°
53°
18
78°
55°
19
77°
50°
20
77°
52°
21
81°
52°
22
85°
56°
23
86°
55°
24
82°
55°
25
85°
54°
26
85°
55°
27
78°
53°
28
83°
56°
29
87°
53°
30
86°
52°
31
82°
49°
1
74°
41°
2
71°
40°
3
70°
43°
4
75°
45°
5
80°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Missoula
Missoula's August 2026 forecast shows daily high temperatures ranging from 70° to 90°, with overnight lows between 40° and 59°. The average high for August is 83° with an average low of 54°. 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 Missoula. See also: September | October | November.
