S
M
T
W
T
F
S
26
82°
63°
27
75°
59°
28
63°
55°
29
82°
61°
30
73°
57°
1
66°
55°
2
72°
48°
3
72°
45°
4
79°
43°
5
81°
46°
6
82°
61°
7
77°
61°
8
70°
54°
9
72°
59°
10
81°
61°
11
81°
61°
12
70°
61°
13
81°
59°
14
77°
52°
15
79°
48°
16
84°
48°
17
90°
61°
18
88°
61°
19
86°
59°
20
88°
64°
21
86°
66°
22
88°
68°
23
82°
67°
24
81°
68°
25
81°
68°
26
81°
67°
27
79°
65°
28
84°
67°
29
79°
66°
30
80°
61°
31
75°
60°
1
78°
60°
2
79°
65°
3
80°
64°
4
81°
63°
5
83°
67°
6
81°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in McKinney
McKinney's May 2026 forecast shows daily high temperatures ranging from 75° to 84°, with overnight lows between 60° and 68°. The average high for May is 80° with an average low of 65°. 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 McKinney. See also: June | July | August.
