S
M
T
W
T
F
S
26
34°
21°
27
38°
18°
28
46°
20°
29
54°
19°
30
59°
21°
1
72°
29°
2
65°
38°
3
74°
32°
4
43°
32°
5
47°
20°
6
52°
17°
7
62°
19°
8
70°
28°
9
59°
23°
10
69°
29°
11
78°
41°
12
74°
34°
13
83°
41°
14
68°
50°
15
51°
29°
16
62°
27°
17
37°
31°
18
40°
26°
19
55°
36°
20
60°
38°
21
61°
38°
22
62°
43°
23
70°
48°
24
69°
46°
25
76°
45°
26
68°
45°
27
72°
46°
28
72°
46°
29
71°
47°
30
68°
43°
31
70°
48°
1
63°
49°
2
69°
48°
3
72°
49°
4
73°
50°
5
72°
49°
6
63°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in McLean
McLean's May 2026 forecast shows daily high temperatures ranging from 37° to 76°, with overnight lows between 26° and 50°. The average high for May is 65° with an average low of 44°. 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 McLean. See also: June | July | August.
