We're in for an extremely hot and humid day across Sarnia-Lambton on Wednesday.
Environment Canada issued a special weather statement Tuesday, saying humidex values are expected to reach 43 Celsius during the afternoon.
The national weather agency said daytime high temperatures of 31 C to 33 C are expected. Overnight lows around the 23 degree mark will provide minimal relief from the heat.
We're urged to drink plenty of water even before feeling thirsty and stay in a cool place. Check on older family, friends, and neighbours and never leave people or pets inside a parked vehicle.
Environment Canada said a heat warning will not be issued because daytime high temperatures will not reach warning criteria on Thursday due to the passage of a cold front.
Heat warnings require hot and humid conditions (temperatures of 31 C or humidex values of 40 C) to last for two days, including the overnight low in between to be 20 C or higher.
We're advised that hot and humid air can also bring deteriorating air quality and can result in the Air Quality Health Index approaching the high risk category.