S
M
T
W
T
F
S
30
77°
62°
31
85°
65°
1
86°
65°
2
87°
68°
3
86°
68°
4
89°
68°
5
85°
65°
6
82°
63°
7
80°
62°
8
82°
63°
9
81°
59°
10
75°
58°
11
73°
56°
12
73°
53°
13
72°
54°
14
71°
50°
15
74°
49°
16
78°
54°
17
76°
54°
18
73°
50°
19
75°
54°
20
76°
53°
21
74°
53°
22
75°
51°
23
73°
52°
24
74°
51°
25
71°
50°
26
68°
45°
27
63°
40°
28
61°
39°
29
62°
40°
30
61°
38°
1
60°
46°
2
61°
47°
3
63°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Wisconsin Dells
Wisconsin Dells's September 2026 forecast shows daily high temperatures ranging from 60° to 89°, with overnight lows between 38° and 68°. 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 Wisconsin Dells. See also: October | November | December.
