S
M
T
W
T
F
S
26
82°
67°
27
83°
63°
28
84°
66°
29
86°
68°
30
91°
62°
31
88°
66°
1
90°
64°
2
85°
63°
3
84°
64°
4
81°
61°
5
82°
62°
6
82°
62°
7
83°
63°
8
81°
65°
9
81°
64°
10
85°
66°
11
86°
68°
12
82°
69°
13
89°
63°
14
89°
60°
15
83°
61°
16
80°
66°
17
82°
67°
18
85°
61°
19
86°
62°
20
82°
66°
21
86°
66°
22
87°
64°
23
88°
65°
24
86°
66°
25
87°
62°
26
87°
62°
27
80°
65°
28
83°
64°
29
82°
66°
30
85°
66°
31
86°
64°
1
86°
61°
2
82°
63°
3
81°
57°
4
78°
56°
5
77°
55°
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 77° to 91°, with overnight lows between 55° and 69°. The average high for August is 84° 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 Helena. See also: September | October | November.
