Toronto, Ontario weather in May

Averages from 2021–2025 (155 days of record).

Average high: 65°F
Average low: 48°F
Rainy days: ~10 per month
Total precipitation: 3.0 in
Warmest recorded: 85°F
Coldest recorded: 33°F

Expect May days in Toronto, Ontario to top out around 65°F and cool to about 48°F overnight, with roughly 10 days of measurable rain across the month. In recent years May has ranged from 33°F to 85°F.

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Current Toronto, Ontario forecast → · Historical data by Open-Meteo (ERA5).