S
M
T
W
T
F
S
26
92°
77°
27
92°
77°
28
96°
80°
29
96°
76°
30
94°
78°
1
88°
61°
2
76°
61°
3
83°
65°
4
86°
72°
5
93°
75°
6
97°
78°
7
89°
73°
8
84°
74°
9
92°
73°
10
92°
73°
11
92°
74°
12
95°
75°
13
93°
74°
14
87°
73°
15
93°
75°
16
93°
75°
17
94°
74°
18
94°
75°
19
93°
75°
20
92°
74°
21
90°
75°
22
93°
75°
23
93°
74°
24
94°
76°
25
90°
76°
26
94°
73°
27
90°
74°
28
92°
76°
29
93°
76°
30
94°
75°
31
92°
75°
1
92°
74°
2
94°
73°
3
96°
76°
4
97°
77°
5
96°
76°
6
94°
74°
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 76° to 97°, with overnight lows between 61° and 78°. The average high for May is 92° with an average low of 74°. 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.
