Toronto Heat Warning in effect for several days

TORONTO, ON. June 2, 2020 — A prolonged period of hot weather is expected and Environment and Climate Change Canada has issued a Heat Warning for Toronto, portions of Southwestern Ontario, the Golden Horseshoe and portions of Eastern Ontario.

This heat warning is in effect from this afternoon through Sunday, and Environment and Climate Change Canada says the heat event is likely to persist into next week.

The extreme heat may cause isolated thunderstorms, but the risk will be low, isolated with little to no relief from the long stretch of heat and humidity throughout stretching right across southern Ontario.

Forecast for Thursday through Sunday:

Maximum temperatures today: 32 to 35 degrees Celsius (Humidex 35 to 38).
Maximum temperatures Friday: 32 to 34 degrees Celsius (Humidex 36 to 40).
Maximum temperatures Saturday: 32 to 35 degrees Celsius (Humidex 36 to 40).
Maximum temperatures Sunday: 31 to 35 degrees Celsius (Humidex 37 to 42).

Evenings will be somewhat cooler with Minimum overnight temperatures for the next fours days ranging between 20 to 23 degrees Celsius.


As part of the Heat Warning, hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index to approach the high risk category.

Extreme heat affects everyone

The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors.

Never leave people or pets inside a parked vehicle.

Watch for the symptoms of heat illness: dizziness/fainting; nausea/vomiting; rapid breathing and heartbeat; extreme thirst; decreased urination with unusually dark urine.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@canada.ca or tweet reports using #ONStorm.