S
M
T
W
T
F
S
30
80°
58°
31
75°
63°
1
74°
64°
2
74°
62°
3
80°
67°
4
83°
63°
5
81°
57°
6
74°
56°
7
74°
56°
8
73°
60°
9
77°
61°
10
73°
56°
11
71°
52°
12
70°
52°
13
71°
55°
14
70°
52°
15
69°
51°
16
68°
50°
17
67°
49°
18
66°
49°
19
67°
50°
20
67°
50°
21
68°
51°
22
68°
53°
23
70°
56°
24
72°
57°
25
73°
57°
26
73°
49°
27
72°
48°
28
64°
55°
29
64°
53°
30
72°
54°
1
69°
53°
2
66°
48°
3
62°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in South Milwaukee
South Milwaukee's September 2026 forecast shows daily high temperatures ranging from 62° to 83°, with overnight lows between 48° and 67°. The average high for September is 71° with an average low of 55°. 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 South Milwaukee. See also: October | November | December.
