S
M
T
W
T
F
S
26
91°
71°
27
84°
70°
28
81°
58°
29
82°
55°
30
86°
54°
31
77°
60°
1
69°
64°
2
78°
58°
3
82°
55°
4
84°
58°
5
79°
66°
6
80°
62°
7
85°
65°
8
80°
59°
9
76°
56°
10
85°
68°
11
81°
69°
12
83°
66°
13
76°
63°
14
81°
63°
15
81°
67°
16
85°
64°
17
80°
62°
18
81°
60°
19
78°
57°
20
78°
51°
21
75°
54°
22
78°
59°
23
74°
50°
24
75°
53°
25
78°
60°
26
81°
61°
27
80°
58°
28
79°
59°
29
82°
62°
30
81°
61°
31
78°
58°
1
79°
57°
2
81°
60°
3
81°
61°
4
79°
58°
5
79°
56°
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 74° to 82°, with overnight lows between 50° and 62°. The average high for August is 79° with an average low of 58°. 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.
