S
M
T
W
T
F
S
27
67°
51°
28
67°
52°
29
66°
52°
30
65°
38°
1
68°
51°
2
67°
51°
3
60°
51°
4
61°
50°
5
68°
51°
6
67°
50°
7
64°
49°
8
65°
44°
9
62°
38°
10
54°
37°
11
54°
36°
12
55°
39°
13
61°
47°
14
64°
47°
15
65°
48°
16
65°
47°
17
63°
40°
18
63°
36°
19
51°
34°
20
52°
36°
21
62°
43°
22
60°
45°
23
59°
44°
24
54°
43°
25
54°
43°
26
56°
44°
27
58°
43°
28
59°
37°
29
52°
35°
30
48°
28°
31
45°
27°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in McHenry
McHenry's October 2026 forecast shows daily high temperatures ranging from 45° to 68°, with overnight lows between 27° and 52°. The average high for October is 60° with an average low of 43°. 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 McHenry. See also: November | December | January.
