Extreme Heat Warning Issued for Toronto

Heat Warning

Prolonged Heatwave to Impact Toronto


As of 5:36 AM EDT on Monday, June 17, 2024, a heat warning is in effect for Toronto. A prolonged heat event will commence today, bringing dangerously hot and humid conditions expected to persist through most of the week.

Today’s Weather Forecast

Toronto will face high temperatures and humidity starting today, with daytime highs reaching up to 32°C and humidex values climbing to 41.

Current Conditions (5:00 AM)

  • Temperature: 16.3°C
  • Condition: Mostly Cloudy
  • Wind: SW at 6 km/h
  • Barometric Pressure: 101.5 kPa (Falling)
  • Humidity: 64%
  • Dew Point: 9.5°C
  • Visibility: 24 km

Forecast for Today

  • Weather: A mix of sun and cloud with a 40% chance of showers early this morning and this afternoon. There is also a risk of thunderstorms.
  • High Temperature: 32°C
  • Humidex: 41
  • UV Index: 9 (Very High)
  • Wind: Southwest at 20 km/h this afternoon

Tonight’s Weather

  • Weather: Partly cloudy with a 30% chance of showers and a risk of thunderstorms.
  • Wind: Southwest at 20 km/h, becoming light in the evening.
  • Low Temperature: 21°C

Tomorrow’s Weather Forecast (Tuesday, June 18)

Expect another hot and humid day with a high temperature of 33°C and humidex values reaching 42.

  • Weather: A mix of sun and cloud with a 30% chance of showers early in the morning and a risk of thunderstorms.
  • High Temperature: 33°C
  • Humidex: 42
  • UV Index: 10 (Very High)
  • Night: Clear skies.
  • Low Temperature: 22°C

Upcoming Weather (Wednesday, June 19)

  • Weather: A mix of sun and cloud with a 30% chance of showers.
  • High Temperature: 31°C
  • Night: Cloudy periods.
  • Low Temperature: 22°C

Safety and Health Risks

Extreme heat can significantly affect health, particularly for vulnerable populations such as older adults, infants, young children, pregnant people, individuals with physical and/or mental illnesses, and those with disabilities or mobility issues.

Precautions to Take

  • Stay Hydrated: Drink plenty of water even if you don’t feel thirsty.
  • Cool Environment: Stay in air-conditioned places as much as possible.
  • Avoid Strenuous Activities: Postpone outdoor activities or reschedule them to cooler parts of the day.
  • Check on Vulnerable Individuals: Ensure that older adults, infants, and those with health issues are staying cool and hydrated.
  • Never Leave Children or Pets in Vehicles: The interior of a parked car can reach deadly temperatures quickly.

Signs of Heat Illness

Watch for symptoms such as swelling, rash, cramps, fainting, heat exhaustion, heat stroke, and the worsening of existing health conditions. Heat stroke is a medical emergency and requires immediate attention. If someone shows signs of heat stroke, call 911 and cool the person immediately by moving them to a cool place, applying cold water, and fanning them.

Wardrobe Suggestions

  • Today and Tomorrow: Wear lightweight, loose-fitting, and light-colored clothing. Use hats and sunglasses, and apply sunscreen with a high SPF.

Weather Trivia for Toronto

Did you know? Toronto’s unique location between Lake Ontario and its many urban structures can create a “heat island” effect, making the city hotter than surrounding areas. This effect can significantly impact local weather patterns, especially during prolonged heat events.

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