S
M
T
W
T
F
S
26
94°
59°
27
91°
55°
28
96°
54°
29
91°
54°
30
95°
55°
31
95°
65°
1
102°
57°
2
84°
53°
3
67°
42°
4
77°
38°
5
84°
42°
6
83°
49°
7
90°
45°
8
86°
56°
9
83°
51°
10
89°
49°
11
86°
50°
12
75°
48°
13
64°
54°
14
59°
54°
15
74°
54°
16
83°
58°
17
83°
51°
18
87°
53°
19
86°
55°
20
90°
49°
21
87°
51°
22
89°
58°
23
91°
58°
24
79°
43°
25
83°
46°
26
91°
53°
27
91°
58°
28
85°
52°
29
85°
55°
30
69°
46°
31
78°
48°
1
86°
54°
2
81°
51°
3
77°
47°
4
76°
45°
5
75°
49°
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 69° to 86°, with overnight lows between 45° and 54°. The average high for August is 77° with an average low of 49°. 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.
