S
M
T
W
T
F
S
26
89°
71°
27
90°
70°
28
90°
72°
29
91°
72°
30
90°
71°
31
89°
70°
1
85°
70°
2
88°
69°
3
87°
70°
4
90°
71°
5
91°
72°
6
91°
71°
7
86°
69°
8
89°
69°
9
88°
68°
10
89°
63°
11
84°
65°
12
83°
64°
13
85°
64°
14
89°
66°
15
85°
67°
16
82°
69°
17
84°
68°
18
88°
68°
19
88°
67°
20
82°
67°
21
82°
68°
22
83°
68°
23
82°
65°
24
87°
66°
25
87°
66°
26
88°
61°
27
82°
61°
28
81°
62°
29
82°
63°
30
81°
64°
31
84°
66°
1
86°
62°
2
80°
60°
3
79°
59°
4
79°
58°
5
80°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in McHenry
McHenry's August 2026 forecast shows daily high temperatures ranging from 79° to 91°, with overnight lows between 58° and 72°. The average high for August is 86° with an average low of 66°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in McHenry. See also: September | October | November.
