S
M
T
W
T
F
S
26
66°
54°
27
67°
55°
28
73°
50°
29
75°
51°
30
75°
55°
1
77°
56°
2
80°
56°
3
68°
52°
4
65°
51°
5
68°
51°
6
74°
56°
7
85°
59°
8
85°
60°
9
81°
59°
10
76°
56°
11
76°
57°
12
76°
58°
13
78°
59°
14
79°
58°
15
69°
50°
16
70°
51°
17
70°
52°
18
71°
51°
19
71°
51°
20
72°
52°
21
78°
56°
22
78°
58°
23
79°
58°
24
78°
57°
25
78°
58°
26
79°
58°
27
78°
56°
28
76°
55°
29
76°
53°
30
72°
54°
31
72°
53°
1
73°
53°
2
75°
55°
3
77°
57°
4
79°
57°
5
77°
58°
6
77°
58°
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 65° to 85°, with overnight lows between 50° and 60°. The average high for May is 75° with an average low of 55°. 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.
