The weather agency says parts of the region could feel like 40 degrees with the humidex.
Overnight temperatures are only expected to fall between 20 C and 24 C, providing minimal relief from the heat.
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It says never leave any person or pet inside a closed vehicle, for any length of time.
Temperatures on Sunday are expected to be between 30 and 33 degrees, with the humidex pushing them to above 40 degrees.
A cold front is expected to to move through the area Tuesday bringing an end to this event.
Monitor for symptoms of heat stroke or heat exhaustion, such as high body temperature, lack of sweat, confusion, fainting, and unconsciousness.