Weather St. Catharines, ON 20°C : °C A few clouds : 15km/h SO : 100.8 kPa : 9°C : 49% : 17°C / : 22°C This evening 22°C Sunny with cloudy periods Tonight 15°C Variable cloudiness Sunday morning 18°C Cloudy 22°C : 30% 20°C : 90% 20°C : 40% 21°C : 40% Stormdesk Link - MOVE