S
M
T
W
T
F
S
30
87°
69°
31
87°
69°
1
87°
73°
2
90°
72°
3
80°
70°
4
85°
68°
5
75°
67°
6
74°
62°
7
76°
60°
8
76°
65°
9
83°
69°
10
75°
58°
11
75°
64°
12
81°
60°
13
71°
56°
14
69°
65°
15
77°
60°
16
70°
60°
17
74°
55°
18
70°
54°
19
70°
54°
20
71°
53°
21
70°
55°
22
73°
56°
23
72°
51°
24
76°
57°
25
71°
57°
26
76°
58°
27
76°
57°
28
75°
57°
29
74°
56°
30
74°
54°
1
70°
50°
2
66°
54°
3
71°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Milwaukee
Milwaukee's September 2026 forecast shows daily high temperatures ranging from 66° to 81°, with overnight lows between 50° and 65°. The average high for September is 73° with an average low of 56°. 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 Milwaukee. See also: October | November | December.
