Toronto Weather: Heat Warning in Effect with Showers and Thunderstorms

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Heat Warning

Current Conditions in Toronto

A heat warning continues to grip Toronto today with a mix of sun and cloud, and a 40 percent chance of showers. The afternoon brings a risk of thunderstorms. The high will reach 29°C, but with the humidex, it will feel like a sweltering 38°C. The UV index is extremely high at 9, so take precautions if you’re outdoors.

Evening Forecast

Tonight, the skies will remain mainly cloudy with a 30 percent chance of showers and a risk of thunderstorms. Temperatures will stay warm with a low of 20°C.

Looking Ahead: Weekend Weather

Saturday, June 22: The weather will be cloudy with a 30 percent chance of showers and a high of 28°C. The night will remain cloudy with a 40 percent chance of showers and a low of 19°C.

Sunday, June 23: Expect continued cloudy conditions with a 40 percent chance of showers and a high of 28°C. Nighttime will bring cloudy periods with a low of 16°C.

Monday, June 24: The day will feature a mix of sun and cloud with a high of 26°C. The night will clear up with temperatures dropping to 16°C.

Prolonged Heat Event

The current heat wave is expected to continue through Friday, with dangerously hot and humid conditions. Daytime highs will range from 30 to 34°C, with humidex values reaching 40 to 44. Overnight lows will stay between 20 and 23°C, with humidex values of 26 to 30. Areas near the Great Lakes may experience slightly cooler conditions.

While slightly cooler and less humid conditions are expected to gradually move in over the weekend, there remains uncertainty about the timing, and heat warnings may persist.

Health and Safety Tips

During this heat wave, it is crucial to stay hydrated by drinking water regularly, even before feeling thirsty. Vulnerable populations, such as older adults, infants, young children, pregnant individuals, and those with physical or mental health conditions, are at greater risk.

  • Never leave people or pets in parked vehicles.
  • Watch for signs of heat illness, including swelling, rash, cramps, fainting, heat exhaustion, and heat stroke. If someone exhibits symptoms of heat stroke—high body temperature, confusion, cessation of sweating, or unconsciousness—call 911 immediately and cool the person with water and fanning while waiting for help.

Wardrobe Suggestions

  • Daytime: Light, breathable clothing and plenty of sunscreen due to the high UV index. Stay in shaded areas as much as possible.
  • Night: Lightweight sleepwear to stay cool and comfortable.

Interesting Weather Trivia

Did you know Toronto’s heat waves are often intensified by its urban landscape, which traps heat? This phenomenon, known as the “urban heat island” effect, can make cities significantly warmer than their rural surroundings.

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