The temperatures in Ontario in August are comfortable with low of 19°C and and high up to 25°C.
You can expect about 3 to 8 days of rain in Ontario during the month of August. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Ontario in August 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
25° / 19°
Rainy Days
5
Snowy Days
0
Dry Days
26
Rainfall
114
mm
Sun Hours
11.2
Hrs
