S
M
T
W
T
F
S
26
58°
46°
27
70°
45°
28
63°
50°
29
67°
52°
30
67°
45°
1
64°
48°
2
57°
42°
3
63°
42°
4
71°
52°
5
74°
52°
6
77°
59°
7
75°
52°
8
67°
47°
9
66°
48°
10
71°
50°
11
73°
49°
12
70°
52°
13
67°
51°
14
69°
56°
15
69°
55°
16
70°
53°
17
69°
57°
18
70°
59°
19
78°
59°
20
78°
58°
21
76°
60°
22
79°
60°
23
80°
59°
24
80°
60°
25
75°
57°
26
73°
60°
27
73°
61°
28
81°
62°
29
78°
61°
30
79°
60°
31
78°
62°
1
76°
56°
2
73°
55°
3
73°
55°
4
74°
56°
5
74°
56°
6
75°
57°
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 57° to 81°, with overnight lows between 42° and 62°. The average high for May is 73° with an average low of 55°. 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.
