The temperatures in Saint Catharines in May are quite cold with temperatures between 9°C and 16°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Saint Catharines. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Saint Catharines in May 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
16° / 9°
Rainy Days
8
Snowy Days
0
Dry Days
23
Rainfall
147
mm
Sun Hours
6.7
Hrs
