Heat warning in effect week of July 7


Oppressive heat wave

A warm and humid air mass over Southern Quebec will continue over the next few days. Beginning Tuesday, temperatures will exceed the 30-degree mark during the day and will not fall below 20 degrees at night. The combined temperature and humidity values will give humidex values of 40.

These conditions could persist through Saturday.

Extreme heat affects everyone.

Consult the latest update from Environment Canada.

Health risks

Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.

During very hot weather, some people are at greater risk of developing health problems, notably:

  • older persons;
  • children under 5 years of age;
  • persons with chronic illnesses, including heart and lung disease;
  • people with mental health problems or drug or alcohol problems.

The main problems linked to heat are:

  • dehydration;
  • headaches;
  • dizziness;
  • confusion;
  • fainting.

If these symptoms are present, call INFO-SANTÉ at 8-1-1 or speak to a health professional. If you have fever in addition to these symptoms, you may have heatstroke, which is a medical emergency. In this case, call 9-1-1 for help.



Protect yourself and prevent health problems

When it is very hot, you need to:

  • drink a lot of water without waiting to be thirsty;
  • cool down by taking a shower or bath in cool water;
  • spend some time in a cool and preferably air-conditioned place, where possible;
  • reduce your level of physical exertion, particularly for those working outdoors;
  • wear light clothing.

Consult Santé Montréal’s website page  What to do when it’s really hot