Ontario temperatures/beach relief Tuesday

The biggest influence will be for beaches along the north and east shores of the lake. Communities where the southerly wind isn’t greatly moderated by the lake will still see temperatures push 30°C, however.

The building heat is expected to create an increasingly unstable atmosphere, which could provide plenty of fuel for thunderstorms (if the trigger is there).

Ontario thunderstorm energy this week

Thunderstorms could be expected Wednesday and Thursday, but the exact location and severity is uncertain. Any storms that do develop will have the potential to become severe.

WATCH: How to keep your cool as a parent this summerHeat safety is vital

Extreme heat claims more lives around the world than any other type of severe weather.

Everyone is susceptible to heat-related illnesses without taking proper precautions, such as frequent breaks, adequate hydration, and air conditioning.

Heat Safety

The compounding stress of hot days followed by muggy nights can be especially hard on vulnerable populations like the elderly, those with chronic health conditions, and folks who live without access to air conditioning. Keep in mind that certain medications can lower your body’s heat tolerance.

WATCH: Here’s what you need to know about heat-related illness