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Hot Weather 

Extreme hot weather can affect everyone's health, especially infants, older adults, people with chronic conditions, and people who do not have adequate housing.

Heat-Related Illnesses

Take steps to help keep yourself cool and healthy during heat waves. This will help prevent heat-related illnesses such as dehydration, heat cramps, heat exhaustion and heat stroke. Symptoms of heat exhaution include: heavy sweating, muscle cramps, headache, fainting/paleness, weakness, dizziness and nausea.

If you experience a heat-related illness, seek medical attention!

Heat Warnings

Environment Canada issues heat warnings when:

• the maximum daytime temperature is forecast to be 31ºC or greater and the night-time temperature is greater or equal to 20º C for two days in a row


• the humidex is forecast to be 40ºC or higher for two days in a row.

An Extended Heat Warning is issued when the same conditions apply, but the heat event is expected to last for three or more days in a row.

For up-to-date weather forecasts and updates on heat warnings,

visit Environment Canada's weather forecasting website.

Beat the Heat:

  • Avoid going out in the sun or heat when possible.

  • Stay cool, and if possible, stay in an air-conditioned place. If your home does not have air conditioning, go to the shopping mall, library, community centre, or friend's house. To see if there is a cooling centre in your community, contact your local municipality.

  • When outdoors, stay in the shade as much as possible. If you plan to go outside during a very hot day, do so early in the morning or evening when it is cooler.

  • Avoid outdoor sports activities or moderately-intense physical activity.

  • Wear loose-fitting, light clothing and a wide brimmed hat.

  • Drink lots of water and natural fruit juices, even if you don't feel very thirsty. Avoid alcohol, coffee/tea and cola drinks.

  • Check in regularly with vulnerable family, friends, neighbours and others who could be affected by the heat. These include children, older adults and persons with chronic illnesses. Make sure they are OK and are well-hydrated.

  • Eat light, cool foods, and avoid heavy meals that involve using the oven or other hot appliances.

  • Keep shades, drapes and blinds closed on the sunny side of your home, but keep windows open slightly. If you do not have air conditioning, use fans.

  • Keep lights off or turned low.

  • Take a cool bath or shower periodically, or cool down with cool, wet towels.

  • Never leave a child or pet in a closed, parked vehicle.

Additional Resources:

Extreme Heat - Ontario Ministry of Health and Long-Term Care

Protect Yourself From Extreme Heat - Health Canada

Extreme Heat: Coping with Heat Waves - Healthy Canadians

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