THUNDER BAY, Ont. — Heat warnings are in effect for much of northern Ontario today.
Environment Canada says hot and humid conditions are expected to continue through Friday.
It says the conditions can also lead to deteriorating air quality.
Read more: Heat warning issued for much of southern Ontario, humidex of 40 expected for several days
The weather agency says temperatures could reach a maximum of 29 to 34 degrees Celsius.
It says people should watch for effects of heat illness, such as fainting, heat exhaustion and heat stroke.
To reduce heat risk, the agency suggests scheduling outdoor activities during the coolest parts of the day.
Torontonians find ways to cool off during heat warning