S
M
T
W
T
F
S
26
40°
34°
27
41°
34°
28
46°
30°
29
40°
35°
30
37°
35°
1
41°
35°
2
47°
35°
3
45°
33°
4
43°
36°
5
44°
29°
6
46°
32°
7
46°
35°
8
45°
36°
9
48°
35°
10
48°
33°
11
47°
35°
12
47°
36°
13
46°
35°
14
62°
46°
15
47°
34°
16
46°
34°
17
47°
35°
18
48°
38°
19
48°
38°
20
49°
37°
21
48°
39°
22
49°
40°
23
51°
41°
24
50°
39°
25
49°
39°
26
50°
38°
27
51°
38°
28
54°
40°
29
58°
43°
30
57°
42°
31
57°
43°
1
58°
40°
2
58°
44°
3
57°
44°
4
59°
43°
5
59°
44°
6
60°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Iliamna
Iliamna's May 2026 forecast shows daily high temperatures ranging from 41° to 62°, with overnight lows between 29° and 46°. The average high for May is 50° with an average low of 38°. 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 Iliamna. See also: June | July | August.
