S
M
T
W
T
F
S
30
80°
57°
31
79°
56°
1
78°
57°
2
77°
56°
3
78°
55°
4
80°
58°
5
80°
60°
6
77°
60°
7
77°
55°
8
82°
54°
9
76°
60°
10
80°
62°
11
82°
60°
12
83°
60°
13
80°
52°
14
75°
56°
15
74°
51°
16
73°
51°
17
70°
58°
18
76°
53°
19
75°
57°
20
72°
49°
21
77°
48°
22
69°
46°
23
77°
56°
24
78°
47°
25
73°
46°
26
Hist. Avg.
70°
48°
27
Hist. Avg.
69°
48°
28
Hist. Avg.
68°
48°
29
Hist. Avg.
68°
47°
30
Hist. Avg.
68°
47°
1
Hist. Avg.
67°
46°
2
Hist. Avg.
67°
46°
3
Hist. Avg.
66°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in West Allis
West Allis's September 2026 forecast shows daily high temperatures ranging from 69° to 83°, with overnight lows between 46° and 62°. The average high for September is 77° 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 West Allis. See also: October | November | December.
