S
M
T
W
T
F
S
30
65°
60°
31
66°
59°
1
76°
63°
2
75°
59°
3
76°
58°
4
66°
58°
5
73°
57°
6
74°
55°
7
77°
55°
8
72°
64°
9
75°
64°
10
70°
50°
11
74°
50°
12
77°
59°
13
65°
53°
14
65°
47°
15
71°
54°
16
67°
49°
17
70°
50°
18
58°
46°
19
62°
46°
20
65°
50°
21
55°
46°
22
58°
47°
23
61°
54°
24
63°
49°
25
68°
50°
26
67°
48°
27
67°
53°
28
69°
52°
29
66°
59°
30
67°
59°
1
66°
52°
2
61°
48°
3
60°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mackinaw City
Mackinaw City's September 2026 forecast shows daily high temperatures ranging from 60° to 69°, with overnight lows between 48° and 59°. The average high for September is 65° with an average low of 53°. 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 Mackinaw City. See also: October | November | December.
