S
M
T
W
T
F
S
26
91°
74°
27
90°
73°
28
89°
72°
29
88°
74°
30
89°
74°
31
92°
73°
1
93°
74°
2
93°
70°
3
92°
72°
4
91°
72°
5
91°
70°
6
89°
72°
7
92°
73°
8
91°
73°
9
92°
74°
10
93°
71°
11
92°
73°
12
92°
73°
13
89°
70°
14
89°
69°
15
88°
69°
16
88°
70°
17
89°
70°
18
90°
73°
19
91°
73°
20
92°
74°
21
91°
73°
22
90°
73°
23
92°
72°
24
92°
74°
25
91°
73°
26
92°
71°
27
91°
72°
28
92°
73°
29
91°
72°
30
87°
72°
31
88°
69°
1
88°
67°
2
86°
67°
3
Hist. Avg.
89°
74°
4
Hist. Avg.
88°
73°
5
Hist. Avg.
88°
73°
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 86° to 93°, with overnight lows between 67° and 74°. The average high for August is 90° with an average low of 72°. 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.
