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Extreme heat set to impact Southern Ontario

  • Writer: Kyle Brookings
    Kyle Brookings
  • 1 day ago
  • 2 min read

The first heat event of the season will get underway across southern Ontario on Monday.

The temperatures will be warmest in the afternoon.


Most areas will see daytime highs of 30 to 32 degrees and humidex values of 36 to 38. Little relief is expected Monday night as lows will only dip to near 20 degrees.


More extreme heat is expected on Tuesday before coming to an end on Tuesday night.


Temperatures will be about 10 degrees above normal for this time of year.

Forecast confidence:

High

 

Impact scale:

Moderate

Extreme heat can become dangerous quickly. Here are some important safety tips:


Stay Hydrated

  • Drink water regularly, even if you don’t feel thirsty

  • Avoid too much caffeine or sugary drinks

  • During heavy activity outdoors, take frequent water breaks

Stay Cool Indoors

  • Use air conditioning if possible

  • Close blinds or curtains during the hottest part of the day

  • Use fans, but remember that fans alone may not prevent heat illness in extreme temperatures

Avoid Peak Heat

The hottest part of the day is usually between 11 a.m. and 4 p.m.

  • Limit strenuous outdoor activities during this time

  • Schedule exercise or yard work early morning or evening

Dress for the Heat

  • Wear lightweight, loose-fitting, light-coloured clothing

  • Use a wide-brimmed hat and sunscreen outdoors

Never Leave People or Pets in Vehicles

Temperatures inside a parked car can rise dangerously fast — even with windows cracked open.

Watch for Heat Illness

Signs of heat exhaustion:

  • Heavy sweating

  • Dizziness

  • Weakness

  • Nausea

  • Headache

Move to a cool place and drink water.

Signs of heat stroke (medical emergency):

  • Confusion

  • Fainting

  • Very high body temperature

  • Hot, dry skin or stopped sweating

Call emergency services immediately if someone shows signs of heat stroke.

Check on Vulnerable People

Older adults, infants, young children, outdoor workers, and people with health conditions are at higher risk.

Protect Pets

  • Ensure pets always have fresh water and shade

  • Avoid walking dogs on hot pavement

  • Watch for overheating signs like excessive panting or lethargy


 
 
 

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