Hot weather and heat warnings
How to avoid heat-related illnesses and learn when we issue heat warnings.
Peel Region's Medical Officer of Health issues heat warnings and extended heat warnings upon notification from Environment and Climate Change Canada that heat thresholds have been met.
As defined by Ontario's Ministry of Health, heat warnings are issued when there are 2 or more consecutive days of:
- Daytime maximum temperatures are expected to reach 31°C or warmer and overnight temperatures are 20°C or warmer.
- Humidex values that are expected to reach 40 or higher.
Extended heat warnings are issued when heat warnings last for 3 or more days.
Extreme heat conditions
When there are extreme heat conditions, try to stay cool, hydrated and pay attention to how you and those around you feel.
Call or visit family, friends, and neighbours, especially seniors who live on their own.
People can suffer heat-related illnesses when their body temperature quickly rises, and they are unable to cool themselves. The risk of heat-related illness increases with the amount of time spent in the heat, the temperature and an individual's sensitivity to heat.
Refer to the following resources to learn more about protecting you and your family from extreme heat: