Get ready to sweat, Toronto — the heat is officially on. Environment Canada issued a heat warning for the GTA, and it’s not just hot, it’s dangerously hot. Temperatures are expected to soar between 30°C and 36°C, but thanks to high humidity (blame those recent rainfalls), it’s going to feel more like 40°C to 45°C. And don’t count on overnight relief — even the lows are sticking around a sweaty 21°C to 25°C.

“This is jungle air,” says senior climatologist Dave Phillips, adding that the extreme humidity is evaporating all the recent rainfall and creating that sticky, oppressive vibe we all dread. And if you think this is as bad as it gets, brace yourself — the real “dog days” of summer are still a month away.

With Monday expected to hit 35°C — the hottest we’ve seen in two years — Phillips warns this is just the beginning. And while the phrase “heat wave” might sound like summer fun, Phillips reminds us it’s no joke: “Heat is the silent killer,” especially dangerous for people with health conditions or limited access to cooling.

The city isn’t taking chances. Over 500 cooling spaces are now open, including libraries, community centres, and civic buildings. There’s also a city-wide wellness check effort underway with the Red Cross to help vulnerable residents stay safe.

If you’re feeling off — headache, dizziness, nausea, dark pee — don’t brush it off. These are signs of heat-related illness, and heat stroke is a medical emergency. Stay hydrated, dress light, and get to a cooler space if you can. Whether that’s a local cooling centre or your friend’s A/C-blessed apartment, just don’t try to tough it out.

For maps to cooling spaces and more hot weather survival tips, check the City of Toronto or Environment Canada websites. Stay cool out there.