S
M
T
W
T
F
S
27
88°
69°
28
82°
64°
29
84°
61°
30
86°
62°
1
90°
60°
2
101°
71°
3
99°
74°
4
99°
73°
5
100°
75°
6
99°
74°
7
99°
74°
8
94°
71°
9
90°
68°
10
82°
64°
11
66°
59°
12
62°
53°
13
71°
49°
14
80°
53°
15
86°
59°
16
90°
72°
17
84°
69°
18
85°
61°
19
85°
63°
20
82°
60°
21
74°
60°
22
65°
58°
23
69°
55°
24
76°
53°
25
79°
54°
26
79°
53°
27
75°
54°
28
76°
57°
29
74°
58°
30
72°
54°
31
68°
54°
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 68° to 79°, with overnight lows between 53° and 58°. The average high for October is 74° with an average low of 55°. 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.
