S
M
T
W
T
F
S
30
79°
54°
31
81°
45°
1
71°
46°
2
70°
53°
3
69°
55°
4
77°
45°
5
77°
43°
6
68°
44°
7
69°
49°
8
72°
50°
9
67°
47°
10
66°
50°
11
66°
48°
12
65°
42°
13
64°
40°
14
64°
42°
15
65°
48°
16
64°
51°
17
70°
50°
18
70°
48°
19
68°
48°
20
64°
45°
21
66°
44°
22
62°
42°
23
59°
37°
24
61°
42°
25
61°
42°
26
63°
39°
27
Hist. Avg.
63°
41°
28
Hist. Avg.
62°
40°
29
Hist. Avg.
62°
40°
30
Hist. Avg.
61°
39°
1
Hist. Avg.
61°
39°
2
Hist. Avg.
60°
39°
3
Hist. Avg.
60°
38°
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 59° to 81°, with overnight lows between 37° and 55°. The average high for September is 68° with an average low of 46°. 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.
