A heat-related Special Weather Statement is in effect for parts of Muskoka.
Bracebridge, Gravenhurst, Huntsville, Baysville, Port Carling and Rosseau are the affected areas.
High heat and humidity is expected through Friday night.
Maximum afternoon temperatures near 30 degrees and humidex values in the high thirties are forecast for this afternoon and Thursday afternoon.
Even hotter daytime maximum temperatures into the low thirties with Humidex values near 40 can be expected Friday afternoon over some areas.
Overnight minimum temperatures tonight will fall below 20 degrees but will remain near or above 20 degrees Thursday night and Friday night.
A cold front early Saturday morning will bring cooler temperatures and lower humidity for the weekend.