It’s going to be a hot one this week. Environment Canada is warning Ontarians about a return of “significant heat and humidity” this Thursday. According to weather experts, warmer air will return to the Ontario weather forecast today with afternoon temperatures expected to sit in the low 30’s and humidex values reaching 40°C.\nThe heat and humidity are expected to peak on Friday and Saturday afternoon with temperatures soaring into the mid 30’s. The humidex value will climb into the mid to upper 40’s. According to The Weather Network it could feel as hot as nearly 50°C tomorrow in parts of southwestern Ontario. The mid-summer heatwave could result in the highest temperatures we’ve seen all year so far.\nThankfully, the extreme heat won’t last too long as a cooler air mass is set to arrive by Monday or Tuesday of next week.\nHeat warnings are currently in effect for Chatham, Rondeau Park, Windsor, Leamington and Essex County.\nThe following 7-day forecast shows 48°C humidex values in Chatham, Ontario on Friday:\nThe Weather Network\nIt'll be nearly as hot in Windsor, Ontario over the next couple days as well:\nThe Weather Network\nEssex, Ontario can expect a stifling 48°C day on Friday:\nThe Weather Network\nThe weather alert is cautioning Ontarians about the effects of extreme heat, from which no one is spared. However, the risks are higher for pregnant women, young children, older adults, people with chronic illnesses, and people who work long hours outdoors or exercise outdoors.\nSymptoms of heat illness include rash, swelling, heat exhaustion, heatstroke, and the worsening of some other health conditions. Ontarians should avoid leaving pets inside a parked vehicle. People who work outside should remember to take regularly scheduled breaks in a cool place.\nHeat warnings are issued when high temperatures or humidity condition rises to the point of posing a threat elevating the risk of heat illnesses, including the potentially fatal effects brought on by heat exhaustion and heatstroke. So, stay cool out there, Ontario.