S
M
T
W
T
F
S
26
60°
49°
27
70°
46°
28
75°
47°
29
81°
52°
30
85°
53°
1
85°
55°
2
77°
56°
3
74°
54°
4
60°
54°
5
65°
53°
6
77°
52°
7
85°
55°
8
85°
54°
9
90°
56°
10
89°
58°
11
95°
60°
12
91°
61°
13
81°
58°
14
89°
57°
15
89°
58°
16
83°
59°
17
78°
58°
18
84°
58°
19
88°
57°
20
92°
56°
21
95°
58°
22
93°
58°
23
86°
54°
24
84°
54°
25
79°
54°
26
72°
54°
27
75°
51°
28
69°
55°
29
75°
52°
30
82°
53°
31
89°
55°
1
94°
57°
2
93°
57°
3
91°
60°
4
90°
61°
5
91°
59°
6
87°
58°
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 75° to 94°, with overnight lows between 52° and 61°. The average high for May is 88° with an average low of 57°. 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.
