S
M
T
W
T
F
S
30
79°
66°
31
82°
69°
1
84°
70°
2
85°
71°
3
84°
70°
4
80°
69°
5
79°
64°
6
79°
57°
7
79°
56°
8
77°
55°
9
77°
69°
10
75°
54°
11
78°
49°
12
78°
60°
13
72°
48°
14
69°
61°
15
75°
61°
16
72°
62°
17
73°
58°
18
71°
58°
19
71°
54°
20
70°
53°
21
69°
53°
22
69°
55°
23
71°
56°
24
70°
57°
25
67°
50°
26
74°
57°
27
74°
56°
28
73°
55°
29
71°
55°
30
69°
56°
1
71°
54°
2
71°
52°
3
68°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Muskegon
Muskegon's September 2026 forecast shows daily high temperatures ranging from 67° to 78°, with overnight lows between 48° and 62°. The average high for September is 71° with an average low of 56°. 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 Muskegon. See also: October | November | December.
