S
M
T
W
T
F
S
30
82°
58°
31
76°
59°
1
78°
57°
2
78°
51°
3
73°
48°
4
73°
51°
5
76°
55°
6
78°
56°
7
81°
56°
8
81°
55°
9
79°
54°
10
76°
54°
11
71°
48°
12
71°
48°
13
70°
46°
14
71°
44°
15
70°
43°
16
69°
41°
17
69°
44°
18
70°
40°
19
67°
39°
20
67°
40°
21
68°
40°
22
68°
43°
23
72°
46°
24
75°
49°
25
76°
50°
26
76°
49°
27
71°
42°
28
75°
48°
29
67°
37°
30
65°
47°
1
66°
46°
2
74°
36°
3
71°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grattan Township
Grattan Township's September 2026 forecast shows daily high temperatures ranging from 65° to 82°, with overnight lows between 35° and 59°. The average high for September is 73° with an average low of 47°. 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 Grattan Township. See also: October | November | December.
