S
M
T
W
T
F
S
30
79°
66°
31
82°
69°
1
84°
71°
2
85°
68°
3
83°
68°
4
82°
65°
5
81°
63°
6
78°
62°
7
78°
61°
8
73°
61°
9
75°
60°
10
76°
63°
11
73°
57°
12
70°
57°
13
72°
56°
14
71°
54°
15
76°
60°
16
77°
59°
17
76°
58°
18
74°
58°
19
76°
60°
20
76°
59°
21
75°
59°
22
76°
58°
23
76°
58°
24
75°
57°
25
76°
57°
26
76°
56°
27
75°
57°
28
74°
56°
29
73°
55°
30
72°
55°
1
72°
54°
2
71°
55°
3
72°
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 70° to 85°, with overnight lows between 54° and 71°. The average high for September is 76° 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 Muskegon. See also: October | November | December.
