Environment Canada has continued a heat warning for Hamilton Sunday.
Environment Canada says mostly sunny skies will allow daytime temperatures to reach the low thirties, with humidex values approaching forty.
These unseasonably warm temperatures are expected to continue into the beginning of the week.
Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.
A cold front is expected to move across Southern Ontario Wednesday bringing cooler temperatures for the remainder of the week.
Environment Canada is advising people to seek a cool place such as a tree-shaded area, swimming pool, shower or bath, or an air-condition spot like a public building.
They are also reminding people to never leave people or pets inside a parked vehicle.