S
M
T
W
T
F
S
27
79°
42°
28
70°
43°
29
68°
47°
30
68°
50°
1
74°
54°
2
77°
54°
3
77°
53°
4
78°
53°
5
78°
54°
6
77°
49°
7
78°
39°
8
72°
40°
9
63°
41°
10
62°
42°
11
66°
47°
12
62°
50°
13
68°
46°
14
75°
40°
15
73°
40°
16
68°
38°
17
67°
38°
18
59°
39°
19
63°
40°
20
61°
43°
21
67°
45°
22
68°
42°
23
68°
38°
24
60°
32°
25
58°
44°
26
63°
35°
27
65°
29°
28
55°
27°
29
50°
28°
30
50°
33°
31
59°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in St. Charles
St. Charles's October 2026 forecast shows daily high temperatures ranging from 50° to 79°, with overnight lows between 27° and 54°. The average high for October is 67° with an average low of 42°. 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 St. Charles. See also: November | December | January.
