Weather in Ottawa in September
Ottawa, Canada averages a high of 20.8°C (69.4°F) and low of 12.3°C (54.1°F) in September, with 9 rain days and 9.1 hours of daily sunshine. Travel score: 76.6/100 (Good). The best time to visit Ottawa is August.
High
21°C69°F
Low
12°C54°F
🌧️
9
rain days
☀️
9.1
hrs/day sunshine
💧
76%
humidity
77— Good
September in Ottawa is mild and occasionally wet — good for most activities.
What are the average temperatures in Ottawa?
How much does it rain in Ottawa in September?
Ottawa receives an average of 89.4mm of rainfall across 9 rainy days in September. The annual total is 1003.6mm.
What should I pack for Ottawa in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 21°C
🧴
Sunscreen SPF 30+
9 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
🎉Visiting Canada in September?
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Data based on 1994–2024 averages · Last updated: 2024-12-31