S
M
T
W
T
F
S
30
79°
61°
31
80°
52°
1
77°
50°
2
74°
51°
3
73°
55°
4
75°
60°
5
80°
50°
6
78°
49°
7
72°
49°
8
72°
57°
9
74°
57°
10
74°
53°
11
71°
54°
12
69°
52°
13
70°
47°
14
69°
46°
15
68°
48°
16
68°
54°
17
69°
54°
18
76°
55°
19
77°
54°
20
75°
53°
21
74°
49°
22
70°
48°
23
67°
45°
24
66°
42°
25
66°
43°
26
Hist. Avg.
68°
48°
27
Hist. Avg.
67°
47°
28
Hist. Avg.
67°
47°
29
Hist. Avg.
66°
46°
30
Hist. Avg.
66°
46°
1
Hist. Avg.
66°
45°
2
Hist. Avg.
65°
45°
3
Hist. Avg.
65°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Waunakee
Waunakee's September 2026 forecast shows daily high temperatures ranging from 66° to 80°, with overnight lows between 42° and 61°. The average high for September is 73° with an average low of 51°. 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 Waunakee. See also: October | November | December.
