S
M
T
W
T
F
S
26
89°
67°
27
90°
67°
28
88°
66°
29
89°
63°
30
84°
64°
31
85°
66°
1
87°
65°
2
85°
60°
3
84°
61°
4
85°
62°
5
86°
64°
6
88°
66°
7
90°
65°
8
90°
63°
9
89°
62°
10
89°
62°
11
88°
63°
12
87°
63°
13
87°
64°
14
86°
66°
15
87°
64°
16
89°
65°
17
86°
62°
18
87°
60°
19
86°
60°
20
87°
61°
21
87°
64°
22
88°
59°
23
85°
60°
24
Hist. Avg.
89°
65°
25
Hist. Avg.
90°
65°
26
Hist. Avg.
90°
64°
27
Hist. Avg.
90°
64°
28
Hist. Avg.
90°
64°
29
Hist. Avg.
89°
64°
30
Hist. Avg.
89°
64°
31
Hist. Avg.
89°
64°
1
Hist. Avg.
89°
64°
2
Hist. Avg.
89°
64°
3
Hist. Avg.
89°
64°
4
Hist. Avg.
89°
64°
5
Hist. Avg.
89°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Sun Valley
Sun Valley's August 2026 forecast shows daily high temperatures ranging from 84° to 90°, with overnight lows between 59° and 67°. The average high for August is 87° with an average low of 63°. 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 Sun Valley. See also: September | October | November.
