S
M
T
W
T
F
S
26
82°
68°
27
85°
66°
28
84°
65°
29
84°
67°
30
85°
69°
31
89°
70°
1
87°
65°
2
84°
65°
3
83°
66°
4
83°
64°
5
84°
64°
6
83°
65°
7
83°
64°
8
84°
65°
9
82°
68°
10
82°
70°
11
83°
69°
12
83°
67°
13
86°
69°
14
88°
64°
15
87°
63°
16
82°
67°
17
85°
68°
18
87°
64°
19
82°
63°
20
81°
62°
21
80°
67°
22
82°
63°
23
81°
68°
24
80°
68°
25
83°
67°
26
81°
69°
27
85°
69°
28
86°
68°
29
86°
67°
30
85°
61°
31
80°
62°
1
79°
61°
2
79°
61°
3
80°
66°
4
80°
61°
5
83°
61°
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 79° to 89°, with overnight lows between 61° and 70°. The average high for August is 83° with an average low of 66°. 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.
