S
M
T
W
T
F
S
30
85°
71°
31
87°
72°
1
83°
70°
2
83°
68°
3
81°
66°
4
84°
67°
5
83°
64°
6
84°
64°
7
84°
61°
8
80°
63°
9
82°
59°
10
77°
57°
11
78°
57°
12
81°
62°
13
81°
61°
14
77°
61°
15
80°
60°
16
80°
61°
17
78°
60°
18
77°
60°
19
79°
61°
20
80°
60°
21
79°
60°
22
79°
59°
23
78°
59°
24
78°
58°
25
77°
59°
26
78°
58°
27
77°
57°
28
77°
57°
29
76°
56°
30
75°
56°
1
74°
55°
2
75°
56°
3
75°
55°
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 74° to 87°, with overnight lows between 55° and 72°. The average high for September is 79° with an average low of 61°. 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.
