S
M
T
W
T
F
S
26
94°
67°
27
95°
67°
28
93°
66°
29
93°
66°
30
92°
65°
31
94°
66°
1
92°
65°
2
92°
66°
3
93°
65°
4
90°
64°
5
89°
66°
6
91°
66°
7
93°
65°
8
93°
64°
9
91°
64°
10
90°
61°
11
88°
63°
12
87°
63°
13
89°
62°
14
90°
65°
15
92°
64°
16
93°
65°
17
94°
61°
18
89°
58°
19
86°
58°
20
88°
63°
21
93°
62°
22
94°
61°
23
94°
63°
24
93°
62°
25
93°
63°
26
92°
59°
27
89°
61°
28
86°
61°
29
85°
59°
30
85°
61°
31
88°
60°
1
90°
60°
2
87°
57°
3
84°
59°
4
85°
55°
5
84°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Sun Valley
Sun Valley's August 2026 forecast shows daily high temperatures ranging from 84° to 95°, with overnight lows between 54° and 67°. The average high for August is 90° with an average low of 62°. 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.
