Summer is officially done, but Mother Nature is still turning up the heat.
Environment Canada has issued a heat warning for a good part of central and southern Ontario.
Weather officials are expecting temperatures to climb to 40 C with humidex on Monday.
Environment Canada says the hot, humid conditions could lead to higher pollution levels in the air.
The weather agency says some people could experience coughing, throat irritation, headaches or shortness of breath.
The warning has been issued for:
- Barrie - Collingwood - Hillsdale
- Midland - Coldwater - Orr Lake
- Orillia - Lagoon City - Washago
- Innisfil - New Tecumseth - Angus
- Orangeville - Grand Valley - Southern Dufferin County
- Shelburne - Mansfield - Northern Dufferin County
- Newmarket - Georgina - Northern York Region
- Pickering - Oshawa - Southern Durham Region
- Uxbridge - Beaverton - Northern Durham Region
- Vaughan - Richmond Hill - Markham
- Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes
- Lindsay - Southern Kawartha Lakes
Young children, pregnant women and seniors are most at risk during high heat.
A cold front is expected to move across Southern Ontario through the day Wednesday bringing cooler temperatures for the remainder of the week.
