Heat warnings issued earlier Friday for the province have now expanded to include all of mainland Nova Scotia, including the Halifax area.
Environment Canada is expecting a high of 31 and a humidex of 35 on Saturday.
Conditions are a little more uncertain for Sunday, but it's expected to be hot and humid until a cold front rolls in later in the day, bringing the possibility of scattered showers.
The national forecaster issues heat warnings when high temperatures and humidity are expected to elevate the risk of heat illnesses, such as heat stroke or heat exhaustion.
"The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors," said the weather advisory. "Drink plenty of water even before you feel thirsty and stay in a cool place."
"Never leave people or pets inside a parked vehicle."
Environment Canada's senior climatologist David Phillips says 200 million people in North America will spend the weekend sweating thanks to something called a heat dome.