S
M
T
W
T
F
S
26
85°
69°
27
88°
71°
28
84°
67°
29
67°
59°
30
63°
56°
1
66°
53°
2
76°
47°
3
82°
59°
4
81°
68°
5
85°
64°
6
82°
49°
7
74°
53°
8
82°
62°
9
81°
64°
10
78°
63°
11
75°
59°
12
80°
60°
13
85°
61°
14
87°
64°
15
84°
66°
16
93°
67°
17
77°
64°
18
79°
66°
19
80°
67°
20
82°
66°
21
84°
60°
22
79°
59°
23
79°
60°
24
81°
63°
25
81°
61°
26
79°
60°
27
80°
61°
28
81°
62°
29
79°
66°
30
79°
67°
31
82°
66°
1
83°
65°
2
84°
64°
3
85°
70°
4
86°
70°
5
83°
69°
6
81°
69°
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 74° to 93°, with overnight lows between 49° and 70°. The average high for May is 82° with an average low of 63°. 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.
