S
M
T
W
T
F
S
26
89°
72°
27
93°
71°
28
94°
74°
29
94°
72°
30
89°
70°
31
90°
71°
1
92°
69°
2
88°
70°
3
88°
68°
4
89°
69°
5
90°
72°
6
88°
71°
7
89°
73°
8
88°
72°
9
88°
72°
10
89°
71°
11
91°
73°
12
91°
73°
13
88°
72°
14
88°
73°
15
89°
73°
16
89°
72°
17
90°
72°
18
87°
71°
19
88°
70°
20
87°
71°
21
87°
69°
22
88°
70°
23
86°
71°
24
86°
72°
25
87°
71°
26
90°
71°
27
91°
70°
28
90°
71°
29
85°
71°
30
84°
70°
31
84°
69°
1
85°
68°
2
85°
66°
3
86°
69°
4
90°
68°
5
91°
69°
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 94°, with overnight lows between 66° and 74°. The average high for August is 89° with an average low of 71°. 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.
