S
M
T
W
T
F
S
27
83°
55°
28
79°
54°
29
76°
53°
30
79°
53°
1
81°
52°
2
83°
52°
3
83°
51°
4
82°
52°
5
83°
52°
6
79°
51°
7
77°
51°
8
76°
50°
9
78°
50°
10
72°
46°
11
74°
48°
12
78°
49°
13
71°
48°
14
68°
48°
15
68°
47°
16
69°
47°
17
69°
46°
18
68°
46°
19
67°
45°
20
67°
45°
21
68°
44°
22
67°
45°
23
65°
29°
24
67°
30°
25
69°
28°
26
64°
33°
27
70°
30°
28
71°
32°
29
68°
32°
30
68°
29°
31
65°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Sun Valley
Sun Valley's October 2026 forecast shows daily high temperatures ranging from 64° to 83°, with overnight lows between 28° and 55°. The average high for October is 73° with an average low of 44°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Sun Valley. See also: November | December | January.
