Weather in Sarnia in September
Sarnia, Canada averages a high of 22°C (71.6°F) and low of 14.8°C (58.6°F) in September, with 9 rain days and 9.8 hours of daily sunshine. Travel score: 81.3/100 (Excellent). The best time to visit Sarnia is August.
High
22°C72°F
Low
15°C59°F
🌧️
9
rain days
☀️
9.8
hrs/day sunshine
💧
73%
humidity
81— Excellent
September in Sarnia is warm and occasionally wet — excellent conditions for exploring.
What are the average temperatures in Sarnia?
How much does it rain in Sarnia in September?
Sarnia receives an average of 73.8mm of rainfall across 9 rainy days in September. The annual total is 825mm.
What should I pack for Sarnia in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather 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