S
M
T
W
T
F
S
26
80°
55°
27
82°
61°
28
74°
61°
29
69°
53°
30
64°
47°
1
62°
45°
2
58°
42°
3
68°
38°
4
82°
54°
5
67°
50°
6
61°
48°
7
64°
47°
8
74°
45°
9
78°
55°
10
76°
59°
11
75°
53°
12
80°
50°
13
78°
58°
14
70°
48°
15
81°
50°
16
85°
68°
17
89°
67°
18
90°
68°
19
88°
68°
20
72°
62°
21
66°
60°
22
67°
61°
23
75°
63°
24
78°
65°
25
80°
65°
26
78°
69°
27
81°
66°
28
84°
62°
29
77°
63°
30
81°
60°
31
79°
57°
1
78°
57°
2
81°
59°
3
79°
62°
4
76°
59°
5
80°
65°
6
83°
67°
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 76° to 84°, with overnight lows between 57° and 67°. The average high for May is 80° with an average low of 62°. 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.
