S
M
T
W
T
F
S
27
70°
47°
28
72°
49°
29
78°
51°
30
70°
60°
1
70°
61°
2
66°
49°
3
69°
45°
4
72°
52°
5
66°
45°
6
73°
55°
7
77°
50°
8
68°
47°
9
70°
53°
10
78°
59°
11
76°
57°
12
70°
53°
13
65°
52°
14
64°
51°
15
64°
51°
16
62°
45°
17
59°
44°
18
59°
44°
19
61°
43°
20
58°
47°
21
55°
47°
22
58°
44°
23
62°
42°
24
52°
39°
25
51°
38°
26
51°
39°
27
52°
38°
28
58°
47°
29
62°
47°
30
61°
48°
31
62°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Arlington Heights
Arlington Heights's October 2026 forecast shows daily high temperatures ranging from 51° to 78°, with overnight lows between 38° and 59°. The average high for October is 63° with an average low of 47°. 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 Arlington Heights. See also: November | December | January.
