S
M
T
W
T
F
S
26
90°
71°
27
91°
71°
28
92°
72°
29
92°
71°
30
91°
70°
31
90°
70°
1
89°
69°
2
91°
71°
3
92°
71°
4
92°
70°
5
91°
71°
6
91°
71°
7
88°
63°
8
89°
66°
9
88°
62°
10
85°
61°
11
84°
61°
12
85°
64°
13
86°
66°
14
85°
65°
15
85°
67°
16
88°
66°
17
84°
64°
18
86°
64°
19
84°
63°
20
83°
63°
21
84°
62°
22
84°
60°
23
87°
64°
24
89°
66°
25
90°
65°
26
90°
65°
27
89°
60°
28
89°
60°
29
84°
62°
30
83°
63°
31
82°
58°
1
83°
59°
2
81°
57°
3
80°
56°
4
80°
56°
5
81°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Helena
Helena's August 2026 forecast shows daily high temperatures ranging from 80° to 92°, with overnight lows between 56° and 72°. The average high for August is 87° with an average low of 65°. 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 Helena. See also: September | October | November.
