The temperatures in Ontario in October are comfortable with low of 17°C and and high up to 26°C.
You can expect a few rainy days in Ontario during October, but usually the weather is comfortable in October.
Our weather forecast can give you a great sense of what weather to expect in Ontario in October 2025.
If you’re planning to visit Ontario in the near future, we highly recommend that you review the 14 day weather forecast for Ontario before you arrive.
Temperatures
26° / 17°
Rainy Days
1
Snowy Days
0
Dry Days
30
Rainfall
10
mm
Sun Hours
11.7
Hrs
