While the weather is expected to cool down later this week, Environment Canada is advising those in affected areas to take care.
For more information on heat-related illness, call HealthLinkBC at 811.
In addition to the severe thunderstorm watch, Chatham-Kent and Windsor-Essex are still under a heat warning.
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Temperatures are expected to reach as high as 31°C today, with a low of 17°C, a few blessed clouds in the air, and a UV index of nine or "very high", according to Environment Canada's most recent forecast.
"Check on older family, friends and neighoburs". Environment Canada is warning that the extreme heat is especially risky for young children, pregnant women, older adults and people with chronic illnesses.
Residents are also encouraged to reschedule outdoor activities or plan them for cooler parts of the day.
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Some slightly cooler weather is in store beginning mid-week as an upper-level trough moves into the interior.
The agency is also reminding those in the area not to leave any person or pet inside a vehicle for any period of time.
Visit here for information on how to reduce your health risk and your personal contribution to pollution levels, as well as for current and forecast AQHI values.
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Watch for the effects of heat illness: swelling, rash, cramps, fainting, heat exhaustion, heat stroke and the worsening of some health conditions.