S
M
T
W
T
F
S
30
79°
54°
31
76°
51°
1
73°
54°
2
73°
52°
3
74°
53°
4
74°
52°
5
72°
52°
6
72°
57°
7
73°
56°
8
73°
54°
9
74°
51°
10
72°
51°
11
71°
52°
12
71°
53°
13
70°
52°
14
71°
50°
15
72°
55°
16
76°
48°
17
75°
49°
18
74°
49°
19
70°
53°
20
76°
53°
21
67°
44°
22
66°
43°
23
Hist. Avg.
70°
48°
24
Hist. Avg.
70°
47°
25
Hist. Avg.
70°
47°
26
Hist. Avg.
69°
46°
27
Hist. Avg.
69°
46°
28
Hist. Avg.
68°
46°
29
Hist. Avg.
68°
45°
30
Hist. Avg.
67°
45°
1
Hist. Avg.
67°
44°
2
Hist. Avg.
66°
44°
3
Hist. Avg.
66°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Zilwaukee
Zilwaukee's September 2026 forecast shows daily high temperatures ranging from 66° to 79°, with overnight lows between 43° and 57°. The average high for September is 73° with an average low of 52°. 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 Zilwaukee. See also: October | November | December.
