S
M
T
W
T
F
S
26
81°
67°
27
83°
64°
28
81°
64°
29
81°
65°
30
83°
69°
31
86°
68°
1
84°
64°
2
81°
63°
3
81°
65°
4
82°
63°
5
81°
63°
6
81°
62°
7
82°
62°
8
80°
63°
9
80°
67°
10
81°
69°
11
80°
68°
12
81°
65°
13
84°
68°
14
86°
62°
15
85°
61°
16
80°
66°
17
83°
66°
18
85°
63°
19
80°
62°
20
79°
61°
21
80°
65°
22
80°
62°
23
79°
66°
24
79°
66°
25
81°
65°
26
79°
66°
27
84°
66°
28
84°
66°
29
83°
65°
30
84°
59°
31
78°
59°
1
78°
60°
2
77°
59°
3
78°
64°
4
78°
58°
5
82°
59°
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 77° to 86°, with overnight lows between 58° and 69°. The average high for August is 81° 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 Great Falls. See also: September | October | November.
