S
M
T
W
T
F
S
26
89°
72°
27
89°
72°
28
90°
73°
29
88°
73°
30
89°
72°
31
90°
74°
1
91°
73°
2
90°
74°
3
93°
74°
4
94°
75°
5
93°
75°
6
92°
74°
7
92°
74°
8
93°
73°
9
90°
74°
10
91°
74°
11
89°
72°
12
90°
73°
13
93°
74°
14
94°
73°
15
93°
73°
16
90°
72°
17
94°
73°
18
95°
72°
19
95°
72°
20
94°
70°
21
93°
72°
22
95°
71°
23
94°
72°
24
93°
71°
25
93°
67°
26
90°
67°
27
89°
66°
28
88°
66°
29
89°
67°
30
89°
68°
31
90°
66°
1
88°
68°
2
88°
66°
3
91°
69°
4
92°
69°
5
92°
70°
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 88° to 95°, with overnight lows between 66° and 75°. The average high for August is 91° 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.
