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
81°
57°
13
70°
50°
14
71°
46°
15
73°
61°
16
72°
61°
17
67°
60°
18
71°
55°
19
62°
53°
20
67°
56°
21
65°
49°
22
68°
46°
23
72°
47°
24
74°
51°
25
69°
47°
26
70°
41°
27
69°
41°
28
74°
48°
29
73°
44°
30
70°
59°
1
67°
53°
2
64°
42°
3
64°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grand Haven
Grand Haven's September 2026 forecast shows daily high temperatures ranging from 64° to 67°, with overnight lows between 42° and 53°. The average high for September is 65° 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 Grand Haven. See also: October | November | December.
