S
M
T
W
T
F
S
27
72°
45°
28
67°
42°
29
62°
48°
30
65°
52°
1
63°
53°
2
67°
49°
3
68°
44°
4
62°
49°
5
59°
50°
6
62°
49°
7
66°
41°
8
67°
40°
9
Hist. Avg.
64°
45°
10
Hist. Avg.
64°
45°
11
Hist. Avg.
63°
45°
12
Hist. Avg.
63°
44°
13
Hist. Avg.
62°
44°
14
Hist. Avg.
62°
44°
15
Hist. Avg.
62°
44°
16
Hist. Avg.
61°
43°
17
Hist. Avg.
61°
43°
18
Hist. Avg.
60°
43°
19
Hist. Avg.
60°
42°
20
Hist. Avg.
60°
42°
21
Hist. Avg.
59°
42°
22
Hist. Avg.
59°
41°
23
Hist. Avg.
58°
41°
24
Hist. Avg.
58°
41°
25
Hist. Avg.
58°
40°
26
Hist. Avg.
57°
40°
27
Hist. Avg.
57°
40°
28
Hist. Avg.
56°
40°
29
Hist. Avg.
56°
39°
30
Hist. Avg.
56°
39°
31
Hist. Avg.
55°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
October Weather in Ontario
Ontario's October 2026 forecast shows daily high temperatures ranging from 59° to 72°, with overnight lows between 40° and 53°. The average high for October is 65° with an average low of 47°. 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.
