Prepare for what Environment Canada says will be the most significant heat event in the past few years.
Heat warnings are in effect from Simcoe County to the GTA and southwestern Ontario.
Over the Canada Day long weekend, daytime highs will reach the low to mid 30s with humidex values into the mid 40s.
These steamy conditions could last through next week.
City of Orillia says several places will act as cooling centres for the public during regular business hours.
Splash pads will be open from 9 a.m. to 9 p.m at four locations, and Orillia's beaches officially open today, with extended hours of lifeguarding supervision at Couchiching Beach Park and Moose Beach.
In Gravenhurst, the Centennial Centre will be open during regular business hours for the public to cool off(Saturday from 7am-6pm, Sunday 10am-3pm, and Monday 5:30am-10pm.)
The YMCA of Simcoe/Muskoka's Health, Fitness & Aquatic Centre will be open and free to the public as cooling centres for the duration of the warning.
Orillia Public Library