S
M
T
W
T
F
S
30
66°
48°
31
61°
49°
1
68°
49°
2
68°
48°
3
69°
40°
4
60°
40°
5
58°
40°
6
58°
39°
7
59°
38°
8
56°
35°
9
55°
39°
10
55°
39°
11
56°
44°
12
56°
46°
13
58°
44°
14
58°
46°
15
56°
41°
16
60°
37°
17
56°
37°
18
55°
45°
19
56°
41°
20
59°
42°
21
54°
36°
22
54°
35°
23
53°
35°
24
53°
36°
25
54°
35°
26
54°
35°
27
53°
39°
28
51°
41°
29
52°
36°
30
50°
42°
1
51°
39°
2
52°
39°
3
50°
36°
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 50° to 69°, with overnight lows between 35° and 49°. The average high for September is 57° with an average low of 40°. 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.
