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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Edition Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Toronto is under a heat wave warning today, with temperatures reaching 34°C and humidex values near 40. This prolonged extreme heat will last through the weekend, with little overnight relief. Toronto weather today and weather in Toronto tomorrow remain dangerously hot before a cold front arrives early next week.
How long will this heat wave last?
Environment and Climate Change Canada forecasts the heat dome to persist for at least four to five days. Daytime highs will hover in the low-to-mid 30s, while nighttime lows only dip to around 22°C. The weather in Toronto 10 days outlook shows a break by Tuesday, with showers and a high near 26°C. For those checking toronto weather 30 days, seasonal normals return after mid-month. No snowfall warning toronto tomorrow is issued—this is strictly a heat event.
What are the health risks during a heat wave?
Heat exhaustion and heat stroke become serious concerns when humidex tops 40. Environment Canada and Health Canada advise staying hydrated, avoiding outdoor exertion during peak afternoon hours, and checking on vulnerable neighbours. The city has opened cooling centres. For longer planning, the toronto weather 14 day trend indicates a return to seasonal values after the ridge weakens.
Is this considered a heat warning?
Yes, Environment and Climate Change Canada has issued a heat warning for Toronto. Criteria: two consecutive days with daytime highs above 31°C and overnight lows above 20°C, or humidex values exceeding 40.
When will the weather in Toronto cool down?
A cold front is expected to cross the region by Monday evening, dropping highs to near 26°C by Tuesday. Until then, the weather in Toronto today and tomorrow will stay dangerously hot.
How does this compare to last summer’s heat waves?
This event is similar in intensity to August 2023 but shorter. It may break daily records if early-morning temperatures stay elevated. The Canada weather warnings page tracks current alerts.