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Extreme Heat

Home...Environmental HealthWeather AlertsExtreme Heat
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Bright sun with thermometer reading hot temperature

Heat advisories and warnings

Southwestern Public Health (SWPH) declares heat warnings when prolonged exposure to outdoor conditions could prove dangerous to public health. Environment and Climate Change Canada’s meteorological services notifies Public Health when there is an impending heat event forecast for our area.

SWPH will then issue a Heat Warning or Extended Heat Warning based on the duration and intensity of the expected conditions:

  • Heat Warning – when forecast temperatures are expected to be at least 31°C and overnight temperatures are at or above 20°C for two days or the Humidex is forecasted to be at least 40°C for two days.
  • Extended Heat Warning – When forecast temperatures are expected to be at least 31°C and overnight temperatures are above 20°C for three or more days or Humidex is at least 40°C for three or more days.

Heat warnings or extended heat warnings are posted on the SWPH website and social media channels, and are distributed to local media, child care providers and other community partners. Learn more about heat alert guidelines for child care centres.

Protecting yourself in hot weather

A combination of high heat and high humidity can be dangerous. Anyone who experiences physical distress because of extreme temperatures should seek medical attention immediately, either by calling 911 or by going to the nearest emergency department. 

  • Drink plenty of water before feeling thirsty and avoid alcoholic and caffeinated beverages
  • Limit time outdoors when the UV Index (ultraviolet ray strength) is most intense, between 11am - 4pm
  • Apply Sunscreen with SPF 30 (or higher) 20-30 minutes before going outside to ensure absorption - Re-apply every 2-3 hours
  • Wear a hat and light, loose-fitted clothing
  • Avoid heavy physical activity outdoors
  • Seek shade at a park or greenspace or use an umbrella
  • Cool off in an air-conditioned space when available
  • Use a fan - you can place a bowl of cold water or ice in front of an electric fan to create a cool breeze
  • Take a cool bath or shower
  • Keep your home cool
    • Close window shades during the hottest part of the day to reduce direct sun exposure
    • Avoid cooking during the hottest period or the day
    • Unplug large electronics such as televisions that produce heat
  • NEVER leave children or pets in a vehicle
  • Visit one of the cooling centres listed below
  • Learn more tips for staying cool without air conditioning

Cooling Centres

Centres like libraries, arenas, and other public buildings are great places for the public to seek relief from the heat. These locations typically include air conditioning, seating and water and are managed by each city, town or township. When a heat warning is issued, these locations can be designated as cooling centres and hours extended if there is a community need. Contact your local municipality for more information.

Aylmer

Family Central
62 Talbot St East, Aylmer, ON
Monday - Friday, 7am - 1pm

East Elgin Community Complex
531 Talbot St W, Aylmer, ON 
Monday - Friday, 8:00am - 9:00pm

Bayham

Straffordville Community Centre
56169 Heritage Line, Straffordville, ON

Monday - Friday, 8:30 AM - 4:30 PM

Dutton Dunwich

Dutton Municipal Office

199 Currie Rd, Dutton, ON

Monday - Friday, 8:30 AM - 4:30 PM, water and seating available

St. Thomas

Joe Thorton Community Centre
75 Caso Crossing, St. Thomas
Open 8:00 AM to 10:00 PM, daily
Phone: 519-633-7112


The INN (formerly Inn Out of the Cold)
10 Princess Avenue, St Thomas
Open 24 hours, 7 days per week
Phone: 519-637-9898 

 

Talbot Teen Centre
745 Talbot Street, St Thomas
Available Tuesdays & Fridays from 1:00 - 4:00 PM 

Malahide

Malahide Community Place
12105 Whittaker Road, Springfield, ON
Monday - Friday, 9:00 am - 4:00 pm

Website for details

Central Elgin

Port Stanley Arena
332 Carlow Rd, Port Stanley, ON

Monday - Friday, 9:00 AM - 4:00 PM

 

Belmont Arena

14020 Belmont Rd, Belmont, ON

Monday - Friday, 9:00 AM - 4:00 PM

West Elgin 
West Elgin Community Health Centre
153 Main Street, SS 1, West Lorne, ON
Monday, Wednesday, Friday, 8:30 AM - 12:00 PM and 1:00 - 4:30 PM
Tuesday and Thursday, 8:30 AM - 9:00 PM
Ingersoll

Fusion Youth Centre 
121 Thames St N. Ingersoll, ON

Monday - Friday, 11:00 AM - 4:00 PM

Tillsonburg

Tillsonburg Mall

200 Broadway, Tillsonburg, ON
Monday - Friday, 10:00 AM - 7:00 PM

Saturday 9:00 AM - 6:00 AM

Sunday 12:00 - 5:00 PM

 

Tillsonburg Community Centre

July 2 - September 5

Monday - Friday, 7:00 AM - 6:00 PM

Saturdays 9:00 AM - 4:00 PM

Sundays closed

Woodstock

Reeves Community Complex - Front Lobby
381 Finkle Street, Woodstock, ON

Monday - Thursday, 9:00 AM - 9:00PM

Friday - Sunday, regular operating hours

Heat related illnesses

Heat cramps

Symptoms of heat cramps include:

  • Painful muscle spasms, usually in the legs but is possible in abdomen
  • Heavy sweating


To treat heat cramps:

  • Apply firm pressure on cramping muscles or gently massage to relieve spasm.
  • Give sips of water.
  • If nausea occurs, discontinue sips of water, move person to a cooler place to rest in a comfortable position. Observe the person carefully for changes in condition.
Heat exhaustion

 Symptoms of heat exhaustion include:

  • Heavy sweating
  • Weakness
  • Cold, pale and clammy skin
  • Weak pulse
  • Fainting and vomiting
  • Core temperature usually 38.8°C or higher, (but normal temperature is possible)


To treat heat exhaustion:

  • Get person out of the sun. Move person to a cooler environment.
  • Lay person down and loosen clothing.
  • Apply cool wet cloths. Give sips of water.
  • If nausea occurs, discontinue sips of water. If vomiting continues, seek immediate medical attention.
Heat stroke

 Signs and symptoms of heat stroke include:

  • High body temperature of 41°C (or higher).
  • Hot, dry skin, rapid and strong pulse, possible unconsciousness.
  • Dizziness, throbbing headache, confusion, restlessness, unconsciousness, or coma.
  • Possible convulsions, nausea, vomiting.


To treat heat stroke:

  • Severe medical emergency - Call 911 immediately and do no give fluids.
  • If immediate medical help is not possible, provide the following care:
    • Move person to a cooler area.
    • Remove or loosen outer clothing.
    • Reduce body temperature by using lukewarm (not cold) water to bathe/sponge the person.
Sunburn

Symptoms of a sunburn include:

  • Redness of skin
  • Pain
  • Swelling of skin, blisters
  • Fever and headaches


To treat a sunburn:

  • Use a cool compress or a cold bath to minimize pain.
  • Leave water blisters intact to speed healing and avoid infection. If blister breaks, apply dry sterile dressing.
  • Serious cases should be seen by a physician.

Heat alert guidelines for child care centres

SWPH strongly urges child care centres to develop extreme weather policies and plans to protect the safety and well-being of the children in your care. Find ways to protect yourself and children during hot weather and know the signs of heat related illness. Be a role model by practicing sun and heat safety behaviour for children to see. 

Get more information

Learn about public weather warnings and visit the following websites for more information:

  • Health Canada: Keep Children Cool! Protect Your Child From Extreme Heat
  • Health Canada: You’re Active in the Heat. You’re at Risk! Protect Yourself From Extreme Heat
  • Health Canada: It’s Way Too Hot! Protect Yourself From Extreme Heat
  • Ontario Ministry of Labour: Heat Stress
  • Health Canada: UV Index and Sun Safety
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