S
M
T
W
T
F
S
26
92°
76°
27
91°
76°
28
93°
75°
29
93°
76°
30
92°
76°
31
93°
75°
1
93°
76°
2
92°
77°
3
94°
76°
4
93°
76°
5
93°
75°
6
94°
77°
7
94°
77°
8
93°
76°
9
92°
75°
10
88°
73°
11
88°
74°
12
91°
74°
13
92°
75°
14
93°
74°
15
92°
75°
16
93°
75°
17
92°
74°
18
93°
69°
19
88°
67°
20
86°
68°
21
86°
68°
22
87°
69°
23
87°
68°
24
88°
68°
25
87°
69°
26
87°
68°
27
88°
68°
28
87°
67°
29
87°
67°
30
86°
68°
31
87°
67°
1
90°
70°
2
91°
71°
3
86°
72°
4
89°
71°
5
90°
71°
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 86° to 94°, with overnight lows between 67° and 77°. The average high for August is 90° with an average low of 72°. 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.
