S
M
T
W
T
F
S
26
58°
44°
27
70°
37°
28
63°
49°
29
60°
54°
30
69°
41°
1
68°
38°
2
60°
45°
3
63°
40°
4
78°
41°
5
85°
58°
6
72°
58°
7
65°
45°
8
73°
37°
9
76°
52°
10
82°
47°
11
64°
47°
12
72°
38°
13
77°
54°
14
63°
51°
15
73°
51°
16
85°
45°
17
88°
57°
18
95°
62°
19
96°
67°
20
95°
64°
21
70°
54°
22
59°
50°
23
55°
50°
24
64°
52°
25
77°
62°
26
76°
62°
27
82°
67°
28
80°
62°
29
80°
62°
30
73°
50°
31
75°
56°
1
79°
56°
2
73°
55°
3
74°
53°
4
81°
58°
5
86°
61°
6
82°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Sun Valley
Sun Valley's May 2026 forecast shows daily high temperatures ranging from 73° to 86°, with overnight lows between 50° and 64°. The average high for May is 78° with an average low of 57°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Sun Valley. See also: June | July | August.
