S
M
T
W
T
F
S
30
69°
43°
31
65°
46°
1
61°
49°
2
65°
53°
3
63°
46°
4
61°
45°
5
58°
51°
6
62°
51°
7
67°
43°
8
66°
39°
9
56°
41°
10
59°
45°
11
60°
43°
12
55°
42°
13
56°
44°
14
60°
47°
15
61°
46°
16
59°
38°
17
54°
37°
18
50°
39°
19
51°
45°
20
53°
40°
21
53°
39°
22
52°
35°
23
50°
41°
24
51°
42°
25
51°
35°
26
50°
35°
27
50°
37°
28
Hist. Avg.
52°
35°
29
Hist. Avg.
51°
35°
30
Hist. Avg.
51°
35°
1
Hist. Avg.
50°
34°
2
Hist. Avg.
50°
34°
3
Hist. Avg.
50°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Grand Rapids
Grand Rapids's September 2026 forecast shows daily high temperatures ranging from 50° to 69°, with overnight lows between 35° and 53°. The average high for September is 58° with an average low of 43°. 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 Rapids. See also: October | November | December.
