Date: July 17, 2019

Showers or thunderstorms ending near noon then mainly cloudy with 40 percent chance of showers. Risk of a thunderstorm late this afternoon. Local amount 15 to 25 mm. High 28. Humidex 37. UV index 7 or high.


Feels like 34C

Environment Canada
Text Size >   A   A   A

Printer Friendly

Extreme Temperatures

Extreme Heat and Your Health

Severe Cold Weather

Sun Safety

Extreme Heat and Your Health

This page was reviewed or revised on Friday, June 9, 2017 11:06 AM

Extreme Heat and Your Health

With the arrival of hot and humid weather, Environment and Climate Change Canada will issue a Heat Warning for our region (South) when the following circumstances occur:

  • Temperatures are expected to reach or exceed 31°C; OR
  • Humidex value is expected to reach or exceed 40. Humidex values are used to express the combined effect of heat and humidity; and
  • Conditions are expected to last 2 days or more.

Fact Sheet - Heat Warning System in Lambton County

An Extended Heat Warning will be issued when the Heat Warning (see above) lasts longer than two days and continues for three or more days.

Lambton Public Health will issue a news release to notify the Lambton County community.

Heat-Related Illness

As the humidex value increases, it becomes harder for the human body to regulate its temperature.

Extreme heat can affect your health many ways: heat stroke, heat exhaustion, dehydration, fatigue, cramps.

Heat exhaustion is a milder form of heat related illness that may develop after several days of exposure to high temperatures and inadequate replacement of fluids.

Heat strokee is the most serious heat-related illness. It occurs when the body is unable to control its temperature. When the body loses its ability to cool itself, the core body temperature rises rapidly. Heat stroke can cause permanent damage to vital organs and may lead to death if emergency treatment is not provided.

Who is at risk?

  • Seniors
  • People with chronic health conditions
  • People who are obese or overweight Infants and very young children
  • Homeless people
  • People who work or are active in a hot environment


Cooling Centre Locations - posted to the highlights section as scheduled
Fact Sheet - Preventing Heat-Related Illness