S
M
T
W
T
F
S
30
81°
65°
31
83°
68°
1
90°
69°
2
91°
73°
3
86°
68°
4
77°
67°
5
79°
59°
6
77°
54°
7
78°
52°
8
81°
56°
9
75°
68°
10
78°
56°
11
77°
49°
12
84°
62°
13
76°
45°
14
70°
58°
15
78°
60°
16
71°
58°
17
71°
59°
18
74°
60°
19
71°
56°
20
66°
54°
21
67°
51°
22
70°
53°
23
71°
51°
24
70°
53°
25
73°
52°
26
71°
48°
27
75°
54°
28
74°
53°
29
72°
53°
30
69°
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 DeWitt
DeWitt's September 2026 forecast shows daily high temperatures ranging from 66° to 78°, with overnight lows between 45° and 60°. The average high for September is 72° with an average low of 54°. 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 DeWitt. See also: October | November | December.
