S
M
T
W
T
F
S
27
84°
51°
28
83°
43°
29
70°
41°
30
69°
48°
1
73°
40°
2
67°
36°
3
65°
40°
4
67°
34°
5
65°
36°
6
64°
33°
7
62°
36°
8
63°
32°
9
60°
34°
10
63°
38°
11
66°
35°
12
63°
30°
13
58°
33°
14
56°
30°
15
56°
26°
16
55°
30°
17
55°
32°
18
59°
37°
19
64°
39°
20
68°
41°
21
68°
32°
22
64°
32°
23
57°
37°
24
65°
36°
25
67°
38°
26
65°
31°
27
57°
32°
28
55°
39°
29
59°
37°
30
55°
38°
31
53°
32°
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 53° to 84°, with overnight lows between 26° and 51°. The average high for October is 63° with an average low of 36°. 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.
