S
M
T
W
T
F
S
26
57°
36°
27
48°
32°
28
55°
27°
29
55°
36°
30
59°
37°
1
66°
36°
2
68°
37°
3
73°
39°
4
73°
45°
5
68°
48°
6
70°
32°
7
73°
46°
8
75°
45°
9
73°
37°
10
75°
43°
11
81°
46°
12
84°
48°
13
79°
54°
14
66°
36°
15
64°
37°
16
55°
29°
17
46°
29°
18
49°
32°
19
54°
38°
20
62°
38°
21
68°
42°
22
64°
36°
23
63°
40°
24
66°
38°
25
60°
37°
26
58°
35°
27
59°
38°
28
64°
37°
29
58°
38°
30
58°
35°
31
63°
38°
1
68°
43°
2
69°
42°
3
69°
44°
4
68°
38°
5
58°
32°
6
58°
33°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Ketchum
Ketchum's May 2026 forecast shows daily high temperatures ranging from 46° to 69°, with overnight lows between 29° and 44°. The average high for May is 61° with an average low of 37°. 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 Ketchum. See also: June | July | August.
