The temperature is expected to break the 30 C mark in the Toronto area for the first time this year, according to Environment Canada.
The weather agency issued a special weather statement Friday morning, explaining that a combination of southerly winds and strong sunshine will make it feel like "mid-summer" in most areas.
The statement said that temperatures will reach the upper 20s and low 30s, but with the humidex it may feel as warm as the mid-30s.
The statement said that areas near the lake will still be several degrees cooler.
Temperatures are expected to dip to the mid-teens overnight before rising again on Saturday afternoon.
"Latest indications are suggesting that temperatures will remain considerably higher than average Sunday and into early next week," the statement said.
The following areas fall under the special weather statement:
- Toronto
- Halton-Peel
- York-Durham
- Hamilton
- Niagara
- Oxford-Brant
- Huron-Perth
- Waterloo-Wellington
- Dufferin-Innisfil
- Grey-Bruce
- Barrie-Orillia-Midland
- Belleville-Quinte-Northumberland
- Kingston-Price Edward
- Peterborough-Kawartha Lakes
- Stirling-Tweed-South Frontenac
- Bancroft-Bon Echo
- Brockville-Leeds and Grenville
- Ottawa-Gatineau
- Prescott-Russell
- Cornwall-Morrisburg
- Smiths Falls-Lanark-Sharbot Lake
- Renfrew-Pembroke-Barry's Bay
- Dunnville-Caledonia-Haldimand
- Simcoe-Delhi-Norfolk
- London-Middlesex
- Elgin
- Windsor-Essex-Chatham-Kent
- Sarnia-Lambton
