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Heat Warning notification for the City of Hamilton July 5, 2021

HAMILTON, ON - The Medical Officer of Health for the City of Hamilton has initiated a Heat Warning beginning on July 5, 2021.  Heat Warnings stay in effect until they are cancelled or escalated to an Extended Heat Warning.

Hot and humid conditions Monday through Tuesday.

Maximum daytime temperatures from 31 to 34 degrees Celsius are expected with humidex values near 40. Overnight low temperatures are forecast to fall to only 21 to 23 degrees, providing little relief from the heat.

A cold front is expected to bring showers and thunderstorms Tuesday evening bringing an end to the heat and humidity.

The City of Hamilton and participating community agencies are responding to the heat by offering “cool places” to go during all stages of a heat event. These locations can be identified by a “Cool Down Here” sign at the entrance. For more information visit

Signs of heat exhaustion include heavy sweating, weakness, cold, pale and clammy skin, weak pulse, fainting and vomiting. If experiencing symptoms, seek help right away – call 9-1-1 of needed.

Reduce your risk of heat-related illness by following these precautions:

  • Drink plenty of water. Avoid drinking alcoholic and caffeinated beverages on hot days.
  • Go to an air-conditioned place. Visit a designated cool place listed on
  • Dress to protect from the heat. Wear lightweight, loose-fitting, light coloured clothing. Wear a hat or take an umbrella to keep your head cool and don’t forget sunscreen.
  • Take it easy. Limit physical activities (walking, running, gardening, etc.) during the day. If rescheduling activities to dawn or dusk when it may be cooler, protect yourself with insect repellant as mosquitoes are more active at such times. Check labels to apply
  • Cool off. Take a cool bath or shower.
  • Keep your living space cool. Close your blinds or curtains. Open windows to let air circulate when using a fan.
  • Never leave children or pets alone in closed vehicles. Temperatures in a car can become life threatening within minutes.
  • Check on your neighbours and family.


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