S
M
T
W
T
F
S
26
93°
71°
27
91°
70°
28
89°
71°
29
92°
74°
30
93°
74°
31
93°
75°
1
92°
74°
2
93°
74°
3
92°
73°
4
93°
72°
5
91°
73°
6
92°
69°
7
91°
70°
8
92°
69°
9
93°
74°
10
93°
74°
11
92°
72°
12
92°
71°
13
93°
74°
14
93°
73°
15
91°
73°
16
92°
72°
17
91°
71°
18
89°
74°
19
92°
73°
20
92°
73°
21
91°
72°
22
91°
73°
23
90°
71°
24
88°
72°
25
91°
71°
26
91°
71°
27
90°
72°
28
91°
72°
29
90°
72°
30
89°
71°
31
87°
69°
1
90°
71°
2
Hist. Avg.
89°
74°
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 87° to 93°, with overnight lows between 69° and 75°. The average high for August is 91° 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.
