The weather office has issued a special weather statement warning of another warm and humid airmass heading our way, but this one will pack more of a wallop.
Environment Canada says we can expect daytime temperatures to reach the low thirties today.
The typical temperature for this time of year is around 21 C.
The weather agency warns that everyone is at risk from the heat especially older adults, infants and young children and people with chronic illnesses.
As well the Maximum Air Quality Health Index will be set at 6 today which means it could be harder to breathe for some people particularly those with respiratory problems.
Environment Canada advises all of us to drink plenty of cold liquids before feeling thirsty, dress for the weather and spend a few hours in a cool place.