S
M
T
W
T
F
S
26
92°
77°
27
92°
77°
28
96°
80°
29
96°
76°
30
94°
78°
1
86°
67°
2
77°
62°
3
86°
62°
4
85°
66°
5
94°
77°
6
101°
81°
7
84°
73°
8
90°
72°
9
88°
78°
10
91°
76°
11
88°
73°
12
89°
70°
13
89°
69°
14
92°
71°
15
92°
76°
16
90°
77°
17
93°
76°
18
90°
76°
19
93°
77°
20
91°
76°
21
92°
75°
22
95°
78°
23
92°
75°
24
90°
74°
25
90°
74°
26
91°
75°
27
91°
76°
28
92°
76°
29
92°
75°
30
94°
77°
31
96°
77°
1
95°
76°
2
95°
77°
3
94°
76°
4
92°
76°
5
92°
76°
6
93°
75°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in McAllen
McAllen's May 2026 forecast shows daily high temperatures ranging from 88° to 96°, with overnight lows between 69° and 78°. The average high for May is 92° with an average low of 75°. 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 McAllen. See also: June | July | August.
