Weather in Sarnia in May
Sarnia, Canada averages a high of 18.4°C (65.1°F) and low of 9.6°C (49.3°F) in May, with 11 rain days and 10.7 hours of daily sunshine. Travel score: 72.3/100 (Good). The best time to visit Sarnia is August.
High
18°C65°F
Low
10°C49°F
🌧️
11
rain days
☀️
10.7
hrs/day sunshine
💧
71%
humidity
72— Good
May in Sarnia is mild and occasionally wet — pack an umbrella and enjoy indoor attractions too.
What are the average temperatures in Sarnia?
How much does it rain in Sarnia in May?
Sarnia receives an average of 79.3mm of rainfall across 11 rainy days in May. The annual total is 825mm.
What should I pack for Sarnia in May?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 18°C
Recommended
🧥
Light rain jacket
Some rainy days expected (11 days)
☔
Umbrella
Be prepared for occasional showers
🧴
Sunscreen
Sun protection is still recommended
🕶️
Sunglasses
Useful for sunny periods
Traveling to Canada in May?
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