S
M
T
W
T
F
S
26
89°
70°
27
84°
71°
28
81°
62°
29
80°
58°
30
84°
57°
31
78°
65°
1
72°
66°
2
77°
63°
3
82°
62°
4
82°
66°
5
74°
63°
6
78°
61°
7
83°
62°
8
86°
67°
9
88°
68°
10
86°
69°
11
85°
64°
12
83°
64°
13
84°
65°
14
83°
63°
15
83°
64°
16
82°
61°
17
86°
67°
18
85°
66°
19
87°
66°
20
82°
65°
21
84°
65°
22
85°
66°
23
85°
65°
24
82°
64°
25
82°
64°
26
83°
63°
27
80°
61°
28
77°
62°
29
80°
61°
30
81°
62°
31
82°
62°
1
81°
61°
2
78°
61°
3
79°
60°
4
79°
60°
5
81°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Crystal Lake
Crystal Lake's August 2026 forecast shows daily high temperatures ranging from 74° to 88°, with overnight lows between 60° and 69°. The average high for August is 82° with an average low of 64°. 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 Crystal Lake. See also: September | October | November.
