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| Extended Forecast - Environment Canada | ||||||
Today
 Sunny Max: 25°C |
Wed, 9 Sep
 A few showers Max: 28°C |
Thu, 10 Sep
 Chance of showers Max: 23°C |
Fri, 11 Sep
Sunny Max: 22°C |
Sat, 12 Sep
Sunny Max: 23°C |
Sun, 13 Sep
 A mix of sun and cloud Max: 23°C |
Mon, 14 Sep
A mix of sun and cloud Max: 21°C |
Tonight
 Increasing cloudiness Min: 20°C |
Night
 Chance of showers Min: 18°C |
Night
 Clear Min: 13°C |
Night
Clear Min: 16°C |
Night
 Cloudy periods Min: 17°C |
Night
 Chance of showers Min: 17°C |
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Forecast
St. Catharines, ON (Issued: 5:00 AM EDT Tuesday 8 September 2026)
- Today
- Sunny. High 25. Humidex 29. UV index 6 or high.
- Tonight
- Clear. Increasing cloudiness late this evening. Low 20.
- Wed, 9 Sep
- Cloudy. A few showers beginning near noon. Risk of a thunderstorm in the afternoon. Wind southwest 30 km/h gusting to 50. High 28. Humidex 36. UV index 4 or moderate.
- Night
- Cloudy with 40 percent chance of showers. Low 18.
- Thu, 10 Sep
- A mix of sun and cloud with 30 percent chance of showers. High 23.
- Night
- Clear. Low 13.
- Fri, 11 Sep
- Sunny. High 22.
- Night
- Clear. Low 16.
- Sat, 12 Sep
- Sunny. High 23.
- Night
- Cloudy periods. Low 17.
- Sun, 13 Sep
- A mix of sun and cloud. High 23.
- Night
- Cloudy periods with 30 percent chance of showers. Low 17.
- Mon, 14 Sep
- A mix of sun and cloud. High 21.
24 Hour Forecast - St. Catharines, ON
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