St. Catharines Weather Forecast

Sunday December 18, 2022
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  • Tonight – Mainly cloudy with 40 percent chance of flurries. Wind west 30 km/h gusting to 50. Low minus 2. Wind chill near minus 9.
  • Monday – Cloudy. 30 percent chance of flurries late in the morning and early afternoon. Wind west 30 km/h gusting to 50. High plus 1. Wind chill minus 9 in the morning. UV index 1 or low.
  • Monday Night – Cloudy. Wind up to 15 km/h. Low minus 3. Wind chill minus 6 overnight.