Photo: StuartMiles - Freerange Stock

St. Catharines Weather Forecast

For Wednesday May 18
/ by
  • Tonight – Partly cloudy. Clearing this evening. Wind west 20 km/h becoming light early this evening. Low plus 4.
  • Wednesday – Sunny. Increasing cloudiness late in the morning then 40 percent chance of showers early in the afternoon. A few showers beginning in the afternoon. High 15. UV index 8 or very high.
  • Wednesday Night – A few showers ending before morning then cloudy with 40 percent chance of showers. Low 10.