S
M
T
W
T
F
S
30
82°
64°
31
83°
56°
1
80°
54°
2
77°
55°
3
76°
59°
4
79°
64°
5
83°
55°
6
83°
54°
7
75°
53°
8
75°
61°
9
76°
61°
10
77°
57°
11
75°
58°
12
72°
57°
13
74°
52°
14
72°
50°
15
71°
51°
16
72°
56°
17
71°
58°
18
78°
58°
19
79°
56°
20
78°
57°
21
77°
52°
22
72°
54°
23
69°
48°
24
68°
46°
25
67°
47°
26
68°
47°
27
Hist. Avg.
69°
52°
28
Hist. Avg.
69°
52°
29
Hist. Avg.
68°
51°
30
Hist. Avg.
68°
51°
1
Hist. Avg.
68°
50°
2
Hist. Avg.
67°
50°
3
Hist. Avg.
67°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Milwaukee
Milwaukee's September 2026 forecast shows daily high temperatures ranging from 67° to 83°, with overnight lows between 46° and 64°. The average high for September is 75° 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 Milwaukee. See also: October | November | December.
