S
M
T
W
T
F
S
30
83°
65°
31
82°
68°
1
88°
69°
2
92°
73°
3
85°
68°
4
77°
67°
5
77°
61°
6
77°
55°
7
77°
55°
8
79°
55°
9
77°
68°
10
75°
55°
11
76°
49°
12
84°
59°
13
71°
47°
14
72°
60°
15
76°
59°
16
71°
59°
17
72°
57°
18
71°
58°
19
70°
56°
20
69°
51°
21
71°
50°
22
70°
50°
23
71°
51°
24
73°
54°
25
73°
52°
26
74°
48°
27
75°
54°
28
74°
54°
29
72°
53°
30
70°
54°
1
72°
52°
2
72°
50°
3
70°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grand Rapids
Grand Rapids's September 2026 forecast shows daily high temperatures ranging from 69° to 76°, with overnight lows between 47° and 60°. The average high for September is 72° with an average low of 53°. 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.
