S
M
T
W
T
F
S
27
66°
49°
28
65°
45°
29
70°
51°
30
69°
50°
1
68°
51°
2
70°
50°
3
68°
46°
4
69°
51°
5
68°
50°
6
65°
51°
7
69°
50°
8
68°
43°
9
56°
40°
10
57°
45°
11
63°
44°
12
64°
46°
13
65°
47°
14
65°
47°
15
66°
46°
16
65°
45°
17
64°
42°
18
54°
45°
19
53°
45°
20
59°
46°
21
62°
39°
22
53°
35°
23
49°
34°
24
50°
42°
25
55°
41°
26
58°
32°
27
48°
31°
28
54°
31°
29
56°
35°
30
59°
40°
31
60°
41°
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 48° to 70°, with overnight lows between 31° and 51°. The average high for October is 61° with an average low of 44°. 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.
