Heat Warning Issued as Temperatures and Humidex Set to Soar Through Canada Day Week

By Scott Arnold

Residents across the region are being urged to take precautions as the first major heat event of the summer arrives, with temperatures expected to feel like the mid-40s.

peterborough is supposed to get a heat wave this week through canada day and the weekend

a heat wave is expected to hit the peterborough area this week, with the possibility of temperatures in the 40s

Lakelands Public Health is encouraging people to stay cool, stay hydrated and check in on vulnerable friends, family members and neighbours as an Orange Heat Warning remains in effect from Tuesday, June 30 through Friday, July 3.

Environment and Climate Change Canada says daytime highs could reach up to 36 C, with the humidex potentially climbing into the mid-40s. Overnight temperatures are also expected to remain between 21 C and 24 C, offering little relief from the heat.

The heat event is expected to end by Saturday, July 4.

Health officials say everyone is at risk of heat-related illnesses during extreme heat, but certain groups are more vulnerable, including older adults, young children, pregnant individuals, people with chronic illnesses or disabilities, those who work outdoors and people experiencing homelessness.

Lakelands Public Health is encouraging residents to check in on loved ones, especially those who live alone, noting that the combination of the season's first heat event and the Canada Day holiday can make conditions particularly dangerous.

Know the signs of heat illness

Symptoms of heat exhaustion can include:

  • Tiredness and weakness

  • Dizziness

  • Nausea or vomiting

  • Headache

  • Rash

  • Dark yellow urine or reduced urination

Anyone experiencing these symptoms should move to a cool place, drink water and seek medical attention if necessary.

Heat stroke is a medical emergency and requires an immediate call to 9-1-1. Symptoms include:

  • Body temperature above 39 C

  • Hot, red skin

  • Confusion or disorientation

  • Fainting

  • Trouble speaking

  • Severe nausea or vomiting

  • Rapid breathing or heartbeat

Tips to stay safe in the heat

Health officials recommend:

  • Drinking plenty of water, even before feeling thirsty

  • Avoiding strenuous outdoor activities

  • Staying out of direct sunlight during the hottest parts of the day

  • Wearing loose, light-coloured clothing

  • Taking cool showers or using cold, wet towels

  • Keeping homes cool by closing blinds and limiting the use of heat-producing appliances

  • Never leaving people or pets inside parked vehicles

Residents looking to cool off are also encouraged to visit air-conditioned public spaces such as libraries and shopping centres or take advantage of local beaches, splash pads and municipal cooling centres.

More information, heat safety tips and current heat alerts are available through Lakelands Public Health.


Scott Arnold
is a Journalist and Content Creator at PTBOCanada Media Inc

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