St. Catharines Weather Forecast

For Friday May 20, 2022
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  • Tonight – Partly cloudy. Clearing before morning. Wind south 20 km/h becoming light this evening. Low 13.
  • Friday – A mix of sun and cloud. 30 percent chance of showers late in the morning and early afternoon. Wind becoming southwest 40 km/h gusting to 60 in the morning then diminishing to 20 gusting to 40 in the afternoon. High 27. Humidex 35. UV index 9 or very high.
  • Friday Night – Mainly cloudy. Wind southwest 20 km/h gusting to 40 becoming light in the evening. Low 19.