S
M
T
W
T
F
S
26
90°
74°
27
92°
65°
28
92°
67°
29
93°
69°
30
99°
68°
31
95°
73°
1
98°
67°
2
94°
68°
3
92°
67°
4
89°
66°
5
90°
67°
6
90°
66°
7
91°
67°
8
91°
69°
9
92°
69°
10
96°
72°
11
98°
72°
12
95°
73°
13
98°
73°
14
97°
65°
15
97°
66°
16
89°
71°
17
93°
72°
18
95°
71°
19
97°
72°
20
97°
72°
21
92°
71°
22
95°
71°
23
94°
70°
24
94°
70°
25
95°
69°
26
95°
69°
27
94°
68°
28
94°
69°
29
93°
69°
30
93°
68°
31
92°
68°
1
92°
67°
2
93°
68°
3
93°
61°
4
92°
60°
5
84°
60°
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 84° to 99°, with overnight lows between 60° and 74°. The average high for August is 93° with an average low of 69°. 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.
