The temperatures in Saint Catharines in August are comfortable with low of 66°F and and high up to 77°F.
You can expect about 3 to 8 days of rain in Saint Catharines 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 Saint Catharines in August 2025.
If you’re planning to visit Saint Catharines in the near future, we highly recommend that you review the 14 day weather forecast for Saint Catharines before you arrive.
Temperatures
77° / 66°
Rainy Days
7
Snowy Days
0
Dry Days
24
Rainfall
5.83
in
Sun Hours
8.4
Hrs
