S
M
T
W
T
F
S
26
70°
38°
27
61°
44°
28
56°
45°
29
65°
41°
30
72°
42°
1
71°
46°
2
74°
48°
3
76°
48°
4
80°
48°
5
68°
48°
6
59°
47°
7
65°
49°
8
62°
46°
9
68°
50°
10
67°
49°
11
70°
46°
12
80°
44°
13
59°
48°
14
59°
48°
15
53°
45°
16
56°
45°
17
63°
47°
18
61°
49°
19
63°
48°
20
65°
50°
21
66°
49°
22
67°
47°
23
66°
46°
24
62°
47°
25
66°
46°
26
64°
48°
27
65°
49°
28
64°
48°
29
67°
47°
30
62°
43°
31
63°
44°
1
70°
50°
2
73°
52°
3
73°
52°
4
71°
51°
5
69°
48°
6
71°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Lake Ketchum
Lake Ketchum's May 2026 forecast shows daily high temperatures ranging from 56° to 73°, with overnight lows between 43° and 52°. The average high for May is 66° with an average low of 48°. 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 Lake Ketchum. See also: June | July | August.
