S
M
T
W
T
F
S
30
71°
53°
31
72°
52°
1
72°
51°
2
70°
51°
3
72°
52°
4
71°
51°
5
72°
54°
6
71°
53°
7
69°
51°
8
71°
53°
9
71°
48°
10
69°
48°
11
72°
49°
12
73°
53°
13
70°
51°
14
68°
52°
15
74°
55°
16
76°
56°
17
74°
55°
18
75°
46°
19
72°
45°
20
66°
45°
21
64°
49°
22
66°
51°
23
71°
51°
24
66°
50°
25
65°
43°
26
66°
41°
27
63°
42°
28
62°
43°
29
61°
42°
30
60°
46°
1
62°
47°
2
Hist. Avg.
65°
42°
3
Hist. Avg.
65°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Waupun
Waupun's September 2026 forecast shows daily high temperatures ranging from 60° to 76°, with overnight lows between 41° and 56°. The average high for September is 69° 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 Waupun. See also: October | November | December.
