In the summer, the combination of high heat, high humidity, and smog can be very dangerous. You need to be extra careful, those especially at risk during these weather conditions include:

  • The elderly
  • People with certain chronic illnesses, such as heart or lung conditions or people unable to move or change position by themselves
  • Infants and preschool children
  • People who exercise vigorously or are involved in strenuous work outdoors for prolonged periods
  • People taking certain medications, for example, for mental health conditions. (Please consult your doctor or pharmacist).

  • Rapid breathing
  • Weakness or fainting
  • More tiredness than usual
  • Headache
  • Confusion

  • Call for help.
  • Remove excess clothing from the person.
  • Cool the person with lukewarm water, by sponging or bathing.
  • Move the person to a cooler location.
  • Give the person sips of cool water, not ice cold water.

If you become ill, faint, have difficulty breathing or feel confused and disoriented, call your doctor.



  • Use your fan in or next to a window. Box fans are best.
  • Use a fan to bring in the cooler air from outside.
  • Use your fan by plugging it directly into the wall outlet. If you need an extension cord, it should be CSA (Canadian Standards Association) approved.


  • Don’t use a fan in a closed room without windows or doors open to the outside.
  • Don’t believe that fans cool air. They don’t. They just move the air around. Fans keep you cool by evaporating your sweat.
  • Don’t use a fan to blow extremely hot air on yourself. This can cause heat exhaustion to happen faster.
  • If you’re afraid to open your window to use a fan, choose other ways to keep cool. See the other tips on this page.

Lightning strikes and lightning injuries are infrequent in Toronto, but weather systems that may bring lightening can come with little warning.

Be prepared for an electrical storm by checking the weather forecast before leaving home for a day outdoors. In Canada, the Environment Canada website has the latest information.

  • Even if there is no rain, if you can hear thunder, you are within striking distance of lighting. Seek shelter immediately.
  • Good places to take shelter include an automobile (with a metal roof), or a grounded building such as a house. Stay sheltered for 30 minutes after the last flash of lightning.
  • While indoors, refrain from using, and preferably unplug electronic equipment such as televisions and computers, as well as appliances, (corded) power tools, or (corded) telephones. Refrain from bathing, showering or washing dishes.
  • If caught outdoors during a thunderstorm, stay away from tall objects such as trees, or any objects or structures that conduct electricity, including metal fences, golf clubs, lawnmowers, bicycles, or umbrellas. Avoid bodies of water.
  • Avoid being the high point in an open area. Low-lying areas are preferable to hillsides.
  • If lighting strikes nearby (for example if 30 or fewer seconds elapse between the flash of lighting and the thunderclap) when you are outdoors with no suitable place to take shelter, crouch down, putting your feet together with the heels touching, and your hands over your ears to protect against hearing damage.

If someone has been struck by lightning, call 9‑1‑1 immediately. People who have been struck by lighting may be in shock, and/or suffering from burns. If breathing has stopped, perform CPR until paramedics arrive. People who have been struck by lightning do not carry an electrical charge and can be safely handled right away.