The hot and humid weather is expected to persist in the Barrie area until Thursday.
Environment Canada is warning humidex levels are expected to reach 43 degrees.
According to the agency, this will be “the most significant heat event in the past few years.”
Environment Canada says after slightly cooler mornings, the daytime highs are expected to be in the low 30s and will continue to Thursday. Humidex values will be in the mid- to high-30s, and will be near the low-40s on both Wednesday and Thursday.
With overnight-low temperatures expected to be in the low-20s and high-teens, there will be little to no relief from the heat overnight.
However, relief is coming. According to Environment Canada, a cooldown is expected on Friday with the passage of a cold front.
While the heat continues, Environment Canada is reminding the public to never leave people or pets inside a parked vehicle.
According to the agency, it is important to watch for the effects of heat illness which include swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions.
While Environment Canada says extreme heat affects everyone, the risks of heat illness are greater for young children, pregnant woman, older adults, people with chronic illnesses and people working or exercising outdoors.
On June 29, the Simcoe Muskoka District Health Unit issued their own warning regarding the extreme heat. The health unit is reminding residents to drink plenty of fluids, to stay cool indoors and to seek out air-conditioned spaces.
If you must be outside, the health unit suggests staying in the shade, wearing sunscreen and weather-appropriate clothing including a wide-brimmed hat, sunglasses, and lightweight light-coloured loose-fitting clothing.