Ottawa Public Health has issued a heat advisory starting on Sunday and until further notice because the humidex is forecast to exceed 36 Celsius for two consecutive days.
OPH is encouraging people to check on family, friends and neighbours who may be isolated or vulnerable to the heat.
Seniors, infants, young children, people who are homeless and people taking certain prescription medications are at a greater risk of suffering from heat-related illnesses.
During a heat advisory, everyone should drink plenty of fluids and limit or avoid caffeine and alcohol. Avoid strenuous physical activity outdoors and direct exposure to the sun.
If you are particularly sensitive to heat, you should try to stay in an air conditioned area.
Residents and visitors can cool down at City of Ottawa pools, splash pads, wading pools, beaches and community centres, as well as Ottawa Public Library branches.
You can pack up the car and head to any of the local beaches Sunday - the city updated its latest e-coli readings and the water has been deemed safe.
The green flag is flying at Britannia Beach, Westoboro Beach, Mooney's Bay, Petrie Island East Bay Beach and Petrie Island River Beaches.