S
M
T
W
T
F
S
26
44°
31°
27
48°
26°
28
51°
26°
29
59°
26°
30
63°
28°
1
65°
29°
2
66°
34°
3
62°
37°
4
46°
34°
5
59°
32°
6
68°
33°
7
70°
34°
8
71°
29°
9
71°
34°
10
79°
34°
11
80°
36°
12
79°
37°
13
68°
39°
14
73°
31°
15
68°
31°
16
61°
34°
17
55°
30°
18
55°
32°
19
62°
26°
20
68°
29°
21
72°
35°
22
68°
36°
23
72°
33°
24
61°
36°
25
54°
33°
26
40°
24°
27
38°
27°
28
41°
33°
29
51°
33°
30
59°
31°
31
60°
34°
1
65°
36°
2
69°
39°
3
67°
40°
4
68°
42°
5
67°
41°
6
61°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Allen
Allen's May 2026 forecast shows daily high temperatures ranging from 38° to 69°, with overnight lows between 24° and 42°. The average high for May is 57° with an average low of 35°. 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 Allen. See also: June | July | August.
