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
83°
59°
4
85°
62°
5
81°
66°
6
80°
67°
7
85°
64°
8
82°
64°
9
84°
61°
10
86°
67°
11
77°
66°
12
81°
66°
13
76°
66°
14
76°
63°
15
81°
67°
16
79°
61°
17
77°
61°
18
78°
59°
19
80°
63°
20
82°
64°
21
83°
61°
22
82°
60°
23
81°
59°
24
76°
62°
25
78°
63°
26
82°
64°
27
83°
63°
28
83°
62°
29
75°
59°
30
73°
59°
31
74°
58°
1
74°
60°
2
76°
61°
3
75°
62°
4
80°
61°
5
81°
62°
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 73° to 86°, with overnight lows between 58° and 67°. The average high for August is 79° 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 Crystal Lake. See also: September | October | November.
