S
M
T
W
T
F
S
26
83°
50°
27
85°
50°
28
85°
49°
29
84°
48°
30
83°
49°
31
85°
48°
1
83°
46°
2
82°
47°
3
81°
46°
4
79°
50°
5
82°
48°
6
83°
47°
7
81°
47°
8
80°
46°
9
84°
49°
10
85°
49°
11
86°
44°
12
79°
41°
13
76°
41°
14
75°
43°
15
76°
39°
16
75°
42°
17
78°
48°
18
82°
50°
19
83°
49°
20
83°
50°
21
84°
48°
22
83°
49°
23
81°
47°
24
74°
49°
25
78°
48°
26
76°
39°
27
72°
41°
28
72°
35°
29
70°
37°
30
69°
36°
31
72°
39°
1
73°
39°
2
76°
41°
3
77°
43°
4
79°
46°
5
80°
44°
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 69° to 86°, with overnight lows between 35° and 50°. The average high for August is 79° with an average low of 45°. 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.
