S
M
T
W
T
F
S
26
58°
41°
27
57°
36°
28
64°
36°
29
71°
35°
30
72°
38°
1
75°
42°
2
74°
44°
3
73°
49°
4
64°
46°
5
72°
46°
6
80°
45°
7
82°
51°
8
80°
48°
9
83°
50°
10
86°
49°
11
88°
52°
12
89°
54°
13
80°
59°
14
82°
48°
15
80°
51°
16
71°
51°
17
52°
40°
18
64°
37°
19
71°
44°
20
77°
51°
21
79°
53°
22
81°
53°
23
84°
49°
24
85°
49°
25
81°
48°
26
73°
38°
27
75°
43°
28
83°
50°
29
81°
47°
30
79°
49°
31
78°
49°
1
79°
46°
2
83°
52°
3
83°
53°
4
84°
53°
5
85°
52°
6
84°
53°
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 71° to 85°, with overnight lows between 38° and 53°. The average high for May is 80° with an average low of 49°. 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.
