S
M
T
W
T
F
S
26
52°
41°
27
63°
41°
28
64°
50°
29
52°
36°
30
46°
32°
1
41°
30°
2
45°
32°
3
64°
47°
4
77°
52°
5
52°
44°
6
48°
37°
7
52°
35°
8
69°
34°
9
69°
48°
10
57°
37°
11
45°
39°
12
70°
35°
13
54°
47°
14
68°
42°
15
77°
50°
16
82°
51°
17
61°
50°
18
81°
65°
19
73°
45°
20
54°
43°
21
52°
43°
22
61°
51°
23
63°
50°
24
73°
54°
25
82°
63°
26
88°
61°
27
77°
50°
28
67°
47°
29
78°
56°
30
70°
50°
31
75°
54°
1
75°
52°
2
80°
55°
3
75°
54°
4
78°
57°
5
81°
61°
6
82°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in West Allis
West Allis's May 2026 forecast shows daily high temperatures ranging from 67° to 88°, with overnight lows between 47° and 61°. The average high for May 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 May weather will actually feel in West Allis. See also: June | July | August.
