S
M
T
W
T
F
S
26
83°
57°
27
88°
58°
28
91°
58°
29
89°
57°
30
78°
53°
31
80°
54°
1
83°
56°
2
90°
57°
3
88°
51°
4
86°
49°
5
82°
56°
6
91°
57°
7
92°
58°
8
90°
54°
9
87°
48°
10
81°
46°
11
79°
44°
12
78°
45°
13
78°
49°
14
80°
44°
15
76°
44°
16
77°
46°
17
79°
52°
18
83°
54°
19
87°
50°
20
79°
51°
21
79°
52°
22
81°
43°
23
75°
42°
24
73°
43°
25
76°
46°
26
75°
49°
27
83°
50°
28
84°
43°
29
73°
43°
30
74°
47°
31
77°
50°
1
82°
51°
2
79°
46°
3
72°
50°
4
77°
50°
5
77°
46°
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 72° to 92°, with overnight lows between 42° and 58°. The average high for August is 81° with an average low of 50°. 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.
