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
72°
50°
14
69°
45°
15
76°
58°
16
70°
60°
17
72°
52°
18
71°
54°
19
65°
56°
20
69°
53°
21
70°
51°
22
69°
46°
23
71°
48°
24
70°
50°
25
71°
49°
26
70°
50°
27
71°
48°
28
67°
43°
29
72°
50°
30
70°
49°
1
73°
49°
2
73°
46°
3
69°
49°
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 76°, with overnight lows between 43° and 60°. The average high for September is 70° with an average low of 51°. 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.
