S
M
T
W
T
F
S
26
69°
42°
27
67°
48°
28
61°
48°
29
51°
41°
30
48°
36°
1
46°
38°
2
49°
32°
3
58°
40°
4
74°
51°
5
52°
42°
6
55°
35°
7
54°
35°
8
62°
33°
9
65°
47°
10
59°
35°
11
57°
36°
12
65°
31°
13
54°
42°
14
60°
39°
15
72°
39°
16
77°
57°
17
86°
60°
18
82°
66°
19
78°
56°
20
62°
49°
21
64°
44°
22
71°
46°
23
62°
52°
24
63°
51°
25
80°
53°
26
86°
56°
27
86°
54°
28
77°
46°
29
78°
48°
30
73°
45°
31
73°
47°
1
73°
47°
2
74°
51°
3
74°
53°
4
76°
54°
5
77°
55°
6
75°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Allegan
Allegan's May 2026 forecast shows daily high temperatures ranging from 73° to 86°, with overnight lows between 45° and 56°. The average high for May is 77° with an average low of 51°. 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 Allegan. See also: June | July | August.
