‘Big change is on the way’: Hot, humid weather set to clear from southern Ontario

After several days of intense heat and humidity, southern Ontario is set to experience a noticeable cooldown.

The change in weather comes after officials issued a heat warning on Friday, the first day of fall. Since then, it has felt like the high 30s factoring in the humidex during the daytime.

READ MORE: Southern Ontario could be affected by high levels of pollution due to hot weather

Hull said it will still be warm and humid Wednesday morning with temperatures getting up to the high 20s by the early afternoon, adding it will feel like 35 C with the humidex.

“The GTA and southern Ontario have had four straight days of record-breaking heat and more records will likely fall tomorrow before the cold front arrives,” Hull said.

He said the morning low on Thursday will be 12 C, which Hull said will be 8 C cooler than Wednesday morning.

READ MORE: Kathleen Wynne questioned about sweltering Ontario schools

Hull said this period of heat set a record for 2017.

“The warmest daytime high and overnight low of the year were recorded during this stretch in Toronto,” he said.

“(It’s) remarkable considering that after the September Equinox, day length starts to diminish with nights getting longer which usually allows for more cooling.”

READ MORE: Heat warning issued for southern Ontario on first official day of fall

However, Hull said we may not be done with above-average temperatures.

“By mid-to-late next week, there looks to be another surge of warm air moving into southern Ontario and the GTA,” he said.

“I don’t expect this warmth to be as impressive as this current heat streak, but temperatures may return to the mid-to-high 20s with humidity values close to 30 C. The normal or average high for October in Toronto is 14 C, so that would be well above average.”