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
74°
47°
7
78°
57°
8
71°
48°
9
69°
51°
10
80°
56°
11
78°
51°
12
88°
58°
13
80°
62°
14
66°
58°
15
62°
47°
16
57°
38°
17
58°
44°
18
64°
50°
19
65°
49°
20
65°
51°
21
67°
53°
22
67°
56°
23
65°
50°
24
65°
47°
25
61°
45°
26
58°
41°
27
61°
38°
28
51°
34°
29
51°
43°
30
55°
41°
31
61°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Mount Prospect
Mount Prospect's October 2026 forecast shows daily high temperatures ranging from 51° to 80°, with overnight lows between 34° and 62°. The average high for October is 62° 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 Mount Prospect. See also: November | December | January.
