S
M
T
W
T
F
S
26
51°
28°
27
49°
29°
28
55°
27°
29
59°
27°
30
61°
30°
1
66°
28°
2
72°
28°
3
75°
33°
4
75°
34°
5
65°
39°
6
66°
47°
7
73°
40°
8
73°
43°
9
72°
38°
10
78°
46°
11
81°
45°
12
79°
47°
13
77°
45°
14
81°
44°
15
78°
47°
16
77°
44°
17
75°
46°
18
76°
46°
19
79°
50°
20
66°
44°
21
63°
43°
22
62°
41°
23
64°
39°
24
68°
40°
25
70°
43°
26
74°
46°
27
75°
46°
28
75°
47°
29
74°
45°
30
75°
47°
31
76°
48°
1
77°
48°
2
76°
49°
3
77°
48°
4
67°
45°
5
75°
49°
6
68°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Idaho Falls West
Idaho Falls West's May 2026 forecast shows daily high temperatures ranging from 62° to 81°, with overnight lows between 38° and 50°. The average high for May is 73° with an average low of 45°. 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 Idaho Falls West. See also: June | July | August.
