Weather in St. Catharines in September
St. Catharines, Canada averages a high of 21.8°C (71.2°F) and low of 15.7°C (60.3°F) in September, with 9 rain days and 9.7 hours of daily sunshine. Travel score: 79.9/100 (Good). The best time to visit St. Catharines is August.
High
22°C71°F
Low
16°C60°F
🌧️
9
rain days
☀️
9.7
hrs/day sunshine
💧
74%
humidity
80— Good
September in St. Catharines is mild and occasionally wet — good for most activities.
What are the average temperatures in St. Catharines?
How much does it rain in St. Catharines in September?
St. Catharines receives an average of 80.7mm of rainfall across 9 rainy days in September. The annual total is 934.7mm.
What should I pack for St. Catharines in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 22°C
🧴
Sunscreen SPF 30+
10 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Light rain jacket
Some rainy days expected (9 days)
☔
Umbrella
Be prepared for occasional showers
Traveling to Canada in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31