S
M
T
W
T
F
S
26
91°
71°
27
85°
69°
28
76°
63°
29
78°
57°
30
85°
56°
31
77°
63°
1
69°
67°
2
76°
63°
3
77°
61°
4
84°
63°
5
78°
66°
6
75°
63°
7
84°
65°
8
81°
62°
9
77°
58°
10
81°
70°
11
78°
68°
12
83°
66°
13
75°
65°
14
78°
65°
15
77°
72°
16
86°
63°
17
82°
64°
18
81°
63°
19
77°
56°
20
79°
61°
21
77°
63°
22
78°
60°
23
77°
62°
24
80°
62°
25
81°
64°
26
80°
64°
27
80°
63°
28
82°
64°
29
79°
60°
30
80°
63°
31
73°
61°
1
72°
64°
2
73°
60°
3
71°
57°
4
72°
58°
5
74°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Grayslake
Grayslake's August 2026 forecast shows daily high temperatures ranging from 71° to 86°, with overnight lows between 56° and 64°. The average high for August is 78° with an average low of 62°. 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 Grayslake. See also: September | October | November.
