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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Civic Maple Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
August in Toronto brings warm, humid days with average highs around 26°C and lows near 17°C. Expect a mix of sun and occasional thunderstorms. Check the live forecast above for current conditions.
What is the typical temperature range in Toronto during August?
Daytime highs in Toronto for August usually sit between 24°C and 28°C. Overnight lows drop to 15–20°C. The city’s position on Lake Ontario moderates extremes, but humidity can make the air feel several degrees warmer. For daily updates, see the Toronto weather page.
How humid is Toronto in August?
Humidity is a key feature of toronto weather august humidity. Average relative humidity ranges from 60% to 80%. This moisture, combined with heat, often produces afternoon thunderstorms. Heat warnings occasionally apply when humidex values exceed 35. For a longer outlook, check the 10-day forecast.
Does it rain a lot in Toronto in August?
Yes. August averages about 76 mm of rain across 8–10 days. Showers are often brief but heavy, especially during late-afternoon thunderstorms. Keep an umbrella handy even on sunny mornings.
Is August a good time to visit Toronto?
It is a popular month for festivals and outdoor events. Warm temperatures and long daylight hours make it pleasant, though humidity and rain can interrupt plans. For a cooler alternative, check august weather ottawa.
How does August compare to September in Toronto?
September brings noticeably lower humidity and slightly cooler highs (around 22°C). August feels stickier and has more thunderstorm days. For details on the transition, see canada weather august september.