Toronto, Ontario weather in August

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

Average high: 78°F
Average low: 63°F
Rainy days: ~10 per month
Total precipitation: 2.8 in
Warmest recorded: 89°F
Coldest recorded: 51°F

Expect August days in Toronto, Ontario to top out around 78°F and cool to about 63°F overnight, with roughly 10 days of measurable rain across the month. In recent years August has ranged from 51°F to 89°F.

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