S
M
T
W
T
F
S
26
66°
49°
27
70°
36°
28
75°
33°
29
78°
36°
30
75°
41°
1
76°
37°
2
76°
46°
3
77°
49°
4
76°
46°
5
63°
42°
6
70°
39°
7
80°
46°
8
86°
49°
9
90°
51°
10
86°
52°
11
90°
52°
12
86°
52°
13
88°
54°
14
86°
52°
15
81°
46°
16
81°
52°
17
85°
51°
18
86°
53°
19
86°
52°
20
85°
53°
21
87°
53°
22
87°
54°
23
86°
54°
24
87°
53°
25
86°
54°
26
87°
54°
27
87°
53°
28
82°
54°
29
80°
54°
30
82°
53°
31
81°
54°
1
81°
55°
2
82°
54°
3
83°
55°
4
82°
55°
5
83°
56°
6
88°
57°
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 63° to 90°, with overnight lows between 39° and 57°. The average high for May is 83° with an average low of 52°. 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.
