Hot Weather Headed to The Big Smoke

Toronto – National Weather – Toronto is starting this Wednesday under mainly sunny skies and pleasant temperatures, but a major heat spike is on the way.

While today remains warm and manageable, Thursday’s forecast calls for a scorching 34°C, with a humidex of 42, making it one of the hottest days of the summer so far.

With high UV levels and a growing risk of heat-related illness, Toronto Public Health is likely to issue heat warnings.

Stay cool, stay hydrated, and prepare for a dramatic shift in conditions.

Today’s Weather Overview

Current Conditions (as of 8:00 AM EDT):

• Temperature: 20.0°C

• Dew Point: 15.9°C

• Humidity: 77%

• Wind: ENE at 6 km/h

• Pressure: 102.2 kPa (falling)

• Humidex: 25

• Visibility: 24 km

• Condition: Mainly Sunny

It’s a mild and pleasant start to the day with calm winds and excellent visibility. A perfect day for outdoor activities—just don’t forget the sunscreen.

Tomorrow’s Forecast

Expected Conditions (July 24 – July 26):

Thursday, July 24:

• Day: Mainly sunny with increasing southwest winds (20 km/h) in the afternoon.

  • High: 34°C

  • Humidex: 42

  • UV Index: 9 (Very High)

• Night: Cloudy periods with 40% chance of showers.

  • Low: 24°C

Friday, July 25:

• Day: Cloudy with 60% chance of showers—possible relief from the heat.

  • High: 29°C

• Night: Mostly cloudy.

  • Low: 20°C

Saturday, July 26:

• Day: Clearing skies bring back sunshine and seasonal warmth.

  • High: 28°C

• Night: Clear and mild.

  • Low: 18°C

A heat event will peak Thursday, followed by more unsettled weather Friday. Saturday looks like a pleasant recovery day with sun and near-normal temperatures.

Wardrobe Recommendations

Plan accordingly for changing conditions:

• Today:

  • Comfortable summer wear like short sleeves or dresses.

  • Sunglasses and SPF 30+ sunscreen due to very high UV.

  • Hat and water bottle if spending time outside.

• Thursday (Heat Alert):

  • Loose, light-colored clothing and a wide-brim hat.

  • Avoid strenuous activity during peak afternoon hours.

  • Seek cool, shaded or air-conditioned environments.

• Friday & Saturday:

  • Keep a rain jacket or umbrella on hand Friday.

  • Dress for warm weather again Saturday with sun protection.

Weather Trivia

Did you know?
Toronto’s hottest July temperature on record was 40.6°C on July 10, 1936—during a deadly North American heatwave. While tomorrow won’t reach that peak, the humidex of 42 places it well within the range of heat illness risk. The city often uses “cooling centers” during such heat events—check with local public health for the nearest location.