S
M
T
W
T
F
S
30
76°
57°
31
75°
58°
1
76°
54°
2
76°
49°
3
71°
47°
4
66°
52°
5
67°
56°
6
72°
49°
7
74°
48°
8
67°
48°
9
66°
50°
10
69°
54°
11
68°
56°
12
73°
54°
13
73°
52°
14
71°
48°
15
65°
45°
16
64°
47°
17
64°
47°
18
63°
43°
19
68°
43°
20
63°
42°
21
59°
48°
22
62°
51°
23
65°
46°
24
64°
44°
25
61°
51°
26
67°
51°
27
66°
45°
28
68°
41°
29
66°
43°
30
58°
48°
1
61°
44°
2
64°
48°
3
58°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mackinac Island State Park
Mackinac Island State Park's September 2026 forecast shows daily high temperatures ranging from 58° to 76°, with overnight lows between 38° and 58°. The average high for September is 67° 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 September weather will actually feel in Mackinac Island State Park. See also: October | November | December.
