S
M
T
W
T
F
S
27
88°
61°
28
84°
57°
29
87°
59°
30
87°
62°
1
88°
62°
2
88°
61°
3
87°
62°
4
86°
61°
5
80°
60°
6
78°
56°
7
78°
53°
8
77°
52°
9
76°
52°
10
78°
54°
11
84°
57°
12
84°
59°
13
83°
60°
14
83°
59°
15
79°
58°
16
78°
58°
17
77°
57°
18
76°
58°
19
75°
56°
20
75°
55°
21
74°
57°
22
75°
53°
23
76°
51°
24
79°
53°
25
79°
49°
26
77°
48°
27
78°
49°
28
77°
50°
29
78°
50°
30
78°
51°
31
77°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Ontario
Ontario's October 2026 forecast shows daily high temperatures ranging from 74° to 88°, with overnight lows between 48° and 62°. The average high for October is 80° with an average low of 56°. 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 Ontario. See also: November | December | January.
