S
M
T
W
T
F
S
30
80°
59°
31
75°
60°
1
76°
59°
2
77°
52°
3
71°
50°
4
71°
52°
5
74°
56°
6
77°
57°
7
79°
58°
8
80°
57°
9
77°
55°
10
74°
57°
11
70°
49°
12
70°
50°
13
70°
47°
14
69°
45°
15
68°
44°
16
69°
42°
17
68°
45°
18
67°
42°
19
66°
40°
20
65°
41°
21
66°
41°
22
67°
44°
23
70°
48°
24
74°
50°
25
75°
52°
26
75°
50°
27
69°
43°
28
73°
49°
29
66°
38°
30
63°
48°
1
65°
48°
2
72°
37°
3
71°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Castleton Township
Castleton Township's September 2026 forecast shows daily high temperatures ranging from 63° to 80°, with overnight lows between 35° and 60°. The average high for September is 71° with an average low of 49°. 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 Castleton Township. See also: October | November | December.
