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| Extended Forecast - Environment Canada | ||||||
Today
 Sunny Max: 25°C |
Sun, 28 Jun
Sunny Max: 27°C |
Mon, 29 Jun
 A mix of sun and cloud Max: 27°C |
Tue, 30 Jun
A mix of sun and cloud Max: 33°C |
Wed, 1 Jul
Sunny Max: 34°C |
Thu, 2 Jul
Sunny Max: 34°C |
Fri, 3 Jul
 Chance of showers Max: 34°C |
Tonight
 A few clouds Min: 14°C |
Night
 Clear Min: 17°C |
Night
 Cloudy periods Min: 20°C |
Night
Cloudy periods Min: 21°C |
Night
Clear Min: 22°C |
Night
Clear Min: 22°C |
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Forecast
St. Catharines, ON (Issued: 11:00 AM EDT Saturday 27 June 2026)
- Today
- Sunny. High 25. Humidex 30. UV index 8 or very high.
- Tonight
- A few clouds. Low 14.
- Sun, 28 Jun
- Sunny. High 27. Humidex 31. UV index 1 or low.
- Night
- Clear. Low 17.
- Mon, 29 Jun
- A mix of sun and cloud. High 27.
- Night
- Cloudy periods. Low 20.
- Tue, 30 Jun
- A mix of sun and cloud. High 33.
- Night
- Cloudy periods. Low 21.
- Wed, 1 Jul
- Sunny. High 34.
- Night
- Clear. Low 22.
- Thu, 2 Jul
- Sunny. High 34.
- Night
- Clear. Low 22.
- Fri, 3 Jul
- Cloudy with 30 percent chance of showers. High 34.
24 Hour Forecast - St. Catharines, ON
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