S
M
T
W
T
F
S
26
57°
28°
27
49°
35°
28
48°
28°
29
48°
32°
30
46°
30°
1
59°
27°
2
72°
43°
3
72°
38°
4
48°
30°
5
42°
29°
6
48°
29°
7
56°
32°
8
64°
37°
9
68°
38°
10
67°
43°
11
65°
45°
12
73°
47°
13
71°
46°
14
68°
43°
15
67°
45°
16
68°
42°
17
71°
47°
18
69°
49°
19
62°
49°
20
64°
40°
21
59°
38°
22
62°
42°
23
66°
43°
24
63°
41°
25
63°
41°
26
64°
42°
27
64°
42°
28
65°
45°
29
68°
52°
30
66°
49°
31
72°
53°
1
76°
55°
2
77°
54°
3
78°
56°
4
79°
57°
5
78°
56°
6
76°
57°
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 42° to 79°, with overnight lows between 29° and 57°. The average high for May is 66° 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 McHenry. See also: June | July | August.
