S
M
T
W
T
F
S
30
78°
70°
31
90°
72°
1
94°
71°
2
95°
71°
3
95°
74°
4
96°
73°
5
88°
71°
6
82°
65°
7
82°
57°
8
89°
69°
9
82°
61°
10
79°
53°
11
83°
64°
12
80°
56°
13
74°
63°
14
76°
57°
15
70°
52°
16
72°
51°
17
67°
48°
18
68°
49°
19
71°
47°
20
68°
50°
21
74°
49°
22
74°
54°
23
76°
54°
24
76°
55°
25
77°
55°
26
76°
54°
27
77°
55°
28
77°
55°
29
75°
54°
30
73°
54°
1
71°
47°
2
62°
43°
3
62°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in De Witt
De Witt's September 2026 forecast shows daily high temperatures ranging from 62° to 89°, with overnight lows between 40° and 69°. The average high for September is 74° 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 De Witt. See also: October | November | December.
