S
M
T
W
T
F
S
26
40°
33°
27
44°
33°
28
48°
32°
29
60°
26°
30
57°
25°
1
63°
24°
2
78°
34°
3
73°
34°
4
60°
36°
5
49°
35°
6
57°
24°
7
70°
24°
8
73°
37°
9
64°
36°
10
75°
33°
11
92°
51°
12
76°
42°
13
92°
41°
14
84°
56°
15
81°
40°
16
84°
45°
17
60°
42°
18
42°
34°
19
59°
37°
20
58°
42°
21
66°
43°
22
60°
45°
23
77°
49°
24
81°
48°
25
89°
55°
26
84°
52°
27
78°
51°
28
79°
54°
29
81°
56°
30
80°
56°
31
74°
48°
1
74°
53°
2
72°
52°
3
69°
52°
4
78°
55°
5
78°
54°
6
74°
54°
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 42° to 89°, with overnight lows between 34° and 56°. The average high for May is 73° with an average low of 50°. 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.
