S
M
T
W
T
F
S
26
58°
42°
27
69°
45°
28
65°
51°
29
54°
36°
30
52°
32°
1
48°
33°
2
55°
42°
3
65°
45°
4
75°
44°
5
55°
39°
6
53°
37°
7
52°
39°
8
63°
46°
9
64°
42°
10
65°
48°
11
63°
48°
12
66°
47°
13
65°
47°
14
70°
48°
15
63°
44°
16
63°
44°
17
64°
53°
18
72°
52°
19
66°
52°
20
70°
53°
21
73°
53°
22
70°
54°
23
74°
49°
24
65°
48°
25
66°
50°
26
68°
55°
27
72°
54°
28
68°
52°
29
69°
48°
30
70°
47°
31
69°
48°
1
69°
53°
2
78°
53°
3
70°
51°
4
70°
49°
5
71°
49°
6
71°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in McHenry
McHenry's May 2026 forecast shows daily high temperatures ranging from 48° to 78°, with overnight lows between 33° and 55°. The average high for May is 66° with an average low of 48°. 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 McHenry. See also: June | July | August.
