S
M
T
W
T
F
S
26
98°
78°
27
98°
77°
28
99°
76°
29
95°
77°
30
94°
75°
31
98°
74°
1
91°
69°
2
83°
68°
3
91°
66°
4
93°
66°
5
94°
64°
6
96°
68°
7
97°
72°
8
94°
74°
9
98°
73°
10
99°
74°
11
95°
75°
12
99°
74°
13
100°
79°
14
100°
72°
15
102°
75°
16
104°
77°
17
101°
74°
18
99°
74°
19
100°
76°
20
98°
75°
21
91°
71°
22
89°
68°
23
97°
74°
24
99°
75°
25
94°
76°
26
94°
73°
27
89°
71°
28
90°
73°
29
91°
72°
30
92°
73°
31
92°
74°
1
93°
74°
2
93°
73°
3
92°
74°
4
92°
74°
5
91°
73°
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 89° to 104°, with overnight lows between 68° and 77°. The average high for August is 95° with an average low of 74°. 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.
