Wednesday
Mainly sunny
High:
27°C
Mainly sunny. Hazy. Wind southwest 30 km/h gusting to 60. High 27. Humidex 31. UV index 9 or very high.
St. Catharines, Ontario Weather - Tomorrow’s Forecast
Wednesday Night
Chance of showers
Overnight low:
17°C
Becoming cloudy in the evening with 40 percent chance of showers late in the evening and after midnight. A few showers beginning overnight. Risk of a thunderstorm late in the evening and overnight. Low 17.
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