S
M
T
W
T
F
S
27
77°
48°
28
75°
49°
29
72°
46°
30
75°
48°
1
70°
42°
2
64°
38°
3
64°
39°
4
65°
38°
5
62°
37°
6
64°
39°
7
63°
37°
8
64°
39°
9
65°
40°
10
65°
39°
11
63°
36°
12
61°
34°
13
58°
33°
14
59°
35°
15
59°
36°
16
60°
40°
17
64°
41°
18
67°
41°
19
67°
40°
20
66°
41°
21
65°
42°
22
65°
43°
23
66°
42°
24
67°
40°
25
64°
41°
26
63°
42°
27
54°
41°
28
61°
42°
29
58°
40°
30
54°
34°
31
52°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Crystal Lake
Crystal Lake's October 2026 forecast shows daily high temperatures ranging from 52° to 77°, with overnight lows between 33° and 49°. The average high for October is 64° with an average low of 40°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Crystal Lake. See also: November | December | January.
