S
M
T
W
T
F
S
30
82°
63°
31
85°
63°
1
85°
57°
2
82°
57°
3
84°
61°
4
78°
61°
5
78°
60°
6
77°
59°
7
77°
57°
8
81°
52°
9
77°
53°
10
76°
61°
11
81°
58°
12
80°
60°
13
80°
59°
14
81°
58°
15
80°
60°
16
82°
59°
17
Hist. Avg.
78°
56°
18
Hist. Avg.
78°
55°
19
Hist. Avg.
78°
55°
20
Hist. Avg.
77°
55°
21
Hist. Avg.
77°
54°
22
Hist. Avg.
76°
54°
23
Hist. Avg.
76°
53°
24
Hist. Avg.
76°
53°
25
Hist. Avg.
75°
52°
26
Hist. Avg.
75°
52°
27
Hist. Avg.
74°
52°
28
Hist. Avg.
74°
51°
29
Hist. Avg.
73°
51°
30
Hist. Avg.
73°
50°
1
Hist. Avg.
72°
50°
2
Hist. Avg.
72°
50°
3
Hist. Avg.
72°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Mackinaw
Mackinaw's September 2026 forecast shows daily high temperatures ranging from 76° to 85°, with overnight lows between 52° and 63°. The average high for September is 80° with an average low of 59°. 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. See also: October | November | December.
