S
M
T
W
T
F
S
26
93°
57°
27
92°
64°
28
94°
59°
29
93°
58°
30
95°
60°
31
95°
57°
1
103°
60°
2
84°
64°
3
70°
47°
4
78°
48°
5
89°
55°
6
95°
56°
7
96°
58°
8
93°
57°
9
90°
59°
10
85°
56°
11
86°
58°
12
90°
59°
13
89°
60°
14
86°
58°
15
87°
57°
16
89°
54°
17
82°
56°
18
86°
58°
19
88°
58°
20
88°
57°
21
86°
57°
22
84°
56°
23
86°
56°
24
86°
52°
25
74°
47°
26
80°
54°
27
86°
57°
28
85°
56°
29
86°
55°
30
83°
56°
31
79°
56°
1
82°
54°
2
73°
52°
3
74°
49°
4
79°
54°
5
82°
54°
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 70° to 96°, with overnight lows between 47° and 60°. The average high for August is 84° with an average low of 55°. 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.
