S
M
T
W
T
F
S
26
82°
63°
27
83°
63°
28
83°
62°
29
85°
64°
30
85°
59°
31
76°
58°
1
76°
59°
2
82°
63°
3
76°
54°
4
77°
60°
5
82°
58°
6
80°
60°
7
85°
58°
8
84°
61°
9
83°
61°
10
85°
58°
11
78°
52°
12
74°
51°
13
76°
51°
14
76°
56°
15
77°
55°
16
76°
53°
17
76°
52°
18
78°
59°
19
80°
61°
20
83°
61°
21
84°
60°
22
84°
61°
23
83°
58°
24
83°
56°
25
74°
55°
26
73°
57°
27
74°
55°
28
81°
50°
29
73°
46°
30
71°
48°
31
72°
56°
1
74°
47°
2
74°
50°
3
72°
47°
4
72°
46°
5
71°
50°
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 71° to 85°, with overnight lows between 46° and 64°. The average high for August is 78° with an average low of 56°. 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.
