S
M
T
W
T
F
S
26
88°
70°
27
91°
72°
28
91°
72°
29
86°
71°
30
87°
72°
31
91°
72°
1
91°
71°
2
92°
72°
3
92°
72°
4
92°
72°
5
91°
72°
6
90°
71°
7
90°
72°
8
91°
72°
9
87°
69°
10
86°
67°
11
86°
66°
12
89°
71°
13
90°
71°
14
90°
70°
15
89°
71°
16
90°
70°
17
91°
69°
18
91°
70°
19
89°
70°
20
90°
69°
21
91°
71°
22
92°
70°
23
90°
69°
24
88°
68°
25
87°
65°
26
86°
65°
27
85°
67°
28
84°
67°
29
83°
65°
30
83°
63°
31
84°
64°
1
86°
65°
2
88°
68°
3
87°
67°
4
88°
66°
5
87°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Great Falls
Great Falls's August 2026 forecast shows daily high temperatures ranging from 83° to 92°, with overnight lows between 62° and 72°. The average high for August is 89° with an average low of 69°. 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 Great Falls. See also: September | October | November.
