S
M
T
W
T
F
S
26
84°
66°
27
90°
70°
28
86°
72°
29
81°
66°
30
68°
61°
1
59°
54°
2
72°
50°
3
79°
45°
4
79°
52°
5
79°
59°
6
82°
59°
7
73°
57°
8
70°
57°
9
77°
64°
10
82°
66°
11
79°
64°
12
82°
59°
13
84°
54°
14
84°
59°
15
90°
64°
16
88°
72°
17
86°
66°
18
89°
74°
19
90°
71°
20
83°
72°
21
84°
71°
22
78°
69°
23
84°
70°
24
82°
70°
25
83°
69°
26
85°
68°
27
86°
70°
28
84°
70°
29
85°
68°
30
84°
67°
31
90°
66°
1
90°
70°
2
89°
69°
3
85°
69°
4
86°
67°
5
86°
69°
6
88°
71°
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 78° to 90°, with overnight lows between 66° and 74°. The average high for May is 86° with an average low of 70°. 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.
