Environmental Health & Hazards
Heat Warnings & Heat-Related Illness
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Current Status: Refer to the alert banner at the top of this page for Heat Response Stage.
The City of Hamilton’s Heat Warning and Information System (HWIS) includes seasonal monitoring and two levels of heat response: Heat Warning and Extended Heat Warning. Extreme heat puts everyone at risk of heat-related illnesses. People at increased risk include:
- those age 65 and older
- young children
- people with chronic medical conditions
- Those unhoused
- people who work and are active outdoors
- People with disabilities
It is important to take steps to protect yourself and your family during heat warnings and extended heat warnings. Extreme heat can cause heat cramps, heat exhaustion, heat stroke and death. Take precautions to reduce your risk of heat-related illnesses.
Throughout the summer, please pay attention to the radio, TV, local newspaper, City website and social media for Public Health heat warnings or extended heat warnings, and for tips and services available in the community to beat the heat.
Response stages
There are two response stages and triggers:
Heat Warning
Two or more consecutive days forecasted with daytime highs greater than or equal to 31°C and nighttime lows greater than or equal to 20°C or two or more consecutive days with a Humidex of 40°C or greater.
Extended Heat Warning
Three or more consecutive days observed with daytime highs greater than or equal to 31°C and nighttime lows greater than or equal to 20°C or three or more consecutive days with a Humidex of 40°C or greater.
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