S
M
T
W
T
F
S
26
70°
59°
27
73°
52°
28
60°
44°
29
62°
41°
30
65°
39°
1
67°
40°
2
65°
38°
3
83°
47°
4
83°
54°
5
56°
45°
6
60°
44°
7
72°
42°
8
71°
51°
9
83°
50°
10
69°
48°
11
79°
45°
12
84°
51°
13
78°
49°
14
82°
55°
15
88°
65°
16
89°
68°
17
86°
70°
18
89°
52°
19
67°
47°
20
67°
51°
21
67°
52°
22
72°
55°
23
77°
61°
24
80°
60°
25
80°
56°
26
83°
62°
27
85°
59°
28
82°
61°
29
78°
58°
30
80°
62°
31
82°
63°
1
83°
62°
2
80°
61°
3
75°
56°
4
75°
58°
5
79°
63°
6
82°
64°
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 67° to 89°, with overnight lows between 47° and 70°. The average high for May is 79° with an average low of 59°. 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.
