S
M
T
W
T
F
S
27
76°
55°
28
75°
55°
29
72°
54°
30
73°
55°
1
73°
52°
2
66°
54°
3
73°
54°
4
74°
55°
5
73°
55°
6
71°
54°
7
71°
53°
8
72°
54°
9
72°
54°
10
71°
53°
11
71°
46°
12
59°
43°
13
57°
39°
14
56°
39°
15
56°
38°
16
57°
43°
17
56°
38°
18
54°
37°
19
54°
37°
20
55°
39°
21
54°
40°
22
54°
38°
23
70°
44°
24
69°
42°
25
62°
39°
26
54°
36°
27
52°
31°
28
50°
33°
29
51°
42°
30
54°
47°
31
61°
35°
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 50° to 76°, with overnight lows between 31° and 55°. The average high for October is 63° with an average low of 45°. 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.
