S
M
T
W
T
F
S
26
84°
52°
27
87°
51°
28
86°
52°
29
84°
52°
30
81°
49°
31
80°
48°
1
78°
46°
2
78°
46°
3
77°
48°
4
79°
51°
5
85°
50°
6
83°
52°
7
85°
53°
8
86°
51°
9
85°
49°
10
85°
52°
11
84°
46°
12
82°
48°
13
76°
46°
14
77°
47°
15
79°
45°
16
80°
49°
17
82°
49°
18
77°
44°
19
73°
40°
20
72°
39°
21
72°
41°
22
74°
41°
23
73°
45°
24
75°
43°
25
79°
46°
26
79°
43°
27
70°
37°
28
71°
41°
29
70°
35°
30
69°
34°
31
69°
37°
1
70°
38°
2
70°
36°
3
67°
35°
4
69°
38°
5
76°
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 67° to 87°, with overnight lows between 34° and 53°. The average high for August is 78° 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.
