S
M
T
W
T
F
S
26
43°
32°
27
44°
30°
28
44°
32°
29
47°
32°
30
45°
30°
1
46°
28°
2
45°
31°
3
46°
32°
4
45°
33°
5
47°
33°
6
49°
38°
7
52°
35°
8
49°
34°
9
48°
37°
10
49°
35°
11
50°
35°
12
51°
40°
13
52°
39°
14
51°
40°
15
52°
42°
16
52°
41°
17
53°
40°
18
57°
46°
19
61°
47°
20
64°
44°
21
55°
41°
22
56°
41°
23
56°
42°
24
57°
47°
25
62°
50°
26
67°
44°
27
70°
42°
28
65°
45°
29
65°
45°
30
62°
46°
31
65°
41°
1
63°
40°
2
61°
41°
3
61°
45°
4
63°
49°
5
65°
49°
6
65°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mackinac Island
Mackinac Island's May 2026 forecast shows daily high temperatures ranging from 43° to 70°, with overnight lows between 28° and 50°. The average high for May is 55° with an average low of 40°. 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 Mackinac Island. See also: June | July | August.
