What to know
- Environment Canada has issued an orange heat warning for Toronto and the GTA as a prolonged heat wave is expected to last through the end of the week.
- Temperatures are forecast to reach the mid-30s, with the humidex making it feel like the low to mid-40s, especially on Wednesday and Thursday.
- Officials warn the extreme heat could worsen air quality and increase the risk of heat-related illnesses, including heat exhaustion and heat stroke.
- The City of Toronto is reminding residents to stay hydrated, limit time outdoors during peak heat and use its network of more than 500 cooling spaces if needed.
Environment Canada has officially issued an orange heat warning for the Greater Toronto Area as a prolonged heat wave moves into the region, with temperatures expected to feel like 40 C or higher beginning Tuesday.
The warning was issued Tuesday morning as hot and humid conditions settle over the city, with the heat expected to persist through the end of the week.
Temperatures expected to peak midweek
Tuesday’s daytime high is forecast to reach 35 C, but when humidity is factored in, it could feel like the low to mid-40s.
According to Environment Canada, the hottest days of the week will likely be Wednesday and Thursday, with daytime highs expected to reach 34 C and 37 C, respectively.
The agency also warns that the combination of heat and humidity could lead to deteriorating air quality, with the Air Quality Health Index potentially approaching the high-risk category.
Watch for signs of heat-related illness
Residents are being urged to take precautions and monitor themselves and others for early signs of heat exhaustion, which may include:
- Headache
- Nausea
- Dizziness
- Thirst
- Dark urine
- Intense fatigue
Environment Canada also advises residents to be aware of symptoms of heat stroke, a medical emergency, including:
- Red, hot skin
- Dizziness
- Nausea
- Confusion or changes in consciousness
How to stay safe during the heat wave
In addition to watching for signs of heat-related illness, residents are encouraged to take the following precautions:
- Drink water regularly, even before you feel thirsty, to stay hydrated.
- Close blinds or shades during the day and open windows if it is cooler outside than indoors.
- Use air conditioning, turn on a fan or move to a cooler part of your home.
- Plan outdoor activities for the coolest parts of the day.
- Limit time in direct sunlight and wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat when outside.
More than 500 cooling spaces available across Toronto
For those looking to escape the heat, the City of Toronto is reminding residents that its Heat Relief Network offers more than 500 cooling spaces throughout the summer.
The network includes libraries, community centres, civic buildings, swimming pools, splash pads and select shopping malls.
A full list of cooling locations is available on the City of Toronto’s website.
