S
M
T
W
T
F
S
26
73°
61°
27
77°
63°
28
72°
63°
29
66°
59°
30
72°
55°
31
77°
57°
1
77°
64°
2
72°
65°
3
76°
63°
4
77°
63°
5
76°
64°
6
75°
65°
7
77°
64°
8
78°
65°
9
79°
63°
10
75°
61°
11
75°
58°
12
72°
57°
13
73°
58°
14
75°
64°
15
73°
54°
16
72°
53°
17
80°
61°
18
79°
60°
19
80°
61°
20
79°
59°
21
77°
56°
22
79°
60°
23
80°
61°
24
80°
61°
25
79°
60°
26
77°
60°
27
75°
59°
28
77°
60°
29
74°
58°
30
76°
59°
31
77°
58°
1
76°
55°
2
70°
51°
3
69°
50°
4
69°
50°
5
71°
51°
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 69° to 80°, with overnight lows between 50° and 65°. The average high for August is 76° with an average low of 59°. 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.
