Wednesday and Thursday will see similar temperatures, but things are expected to cool down on Friday.
The heat - with daytime highs again topping 35C - returns Sunday is is expected to run through much of the following week.
The alert was issued on Saturday, when the temperature reached 27 C but felt more like 35 during the afternoon.
Island Health has also issued its own public service announcement on the hot temperatures, reinforcing Environment Canada's message to check on those who may be vulnerable.
Families and friends are encouraged to watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions.
Environment Canada said slightly cooler weather is in store for mid-weed as another system moves through the area.
According to Environment Canada, risks associated with the heat wave "are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors".
Reduce your heat risk.
The agency is also reminding those in the area not to leave any person or pet inside a vehicle for any period of time. They can also make breathing more hard.