A heat warning has been issued by Environment Canada for Halton Region, effective tomorrow (June 20).
Temperatures are expected to reach 31 degrees Celsius or higher, with overnight lows only cooling to the low 20s.
Hot and humid weather can raise the Air Quality Health Index into the high risk category.
Those at higher risk of heat-related illness, such as young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors should take extra precautions.
Halton officials emphasize that it's important to check-in regularly, by phone or video, with vulnerable family, friends and neighbours; especially seniors who live on their own, to make sure they are staying cool and hydrated.
If you or someone in your care experiences rapid breathing, headache, confusion and lack of coordination, weakness or fainting, seek medical attention right away by calling 911.
Never leave people or pets inside a parked vehicle.
Temperatures should cool by Thursday.