TORONTO – WEATHER – A mainly sunny and humid Friday is unfolding across the Greater Toronto Area as southern Ontario braces for the peak of this summer heat wave. Hazy skies and sweltering conditions are expected by this afternoon, with humidex values soaring into the upper 30s. The weekend ahead will be even hotter, with Sunday expected to match or exceed 32°C under full sun.

Today’s Weather Overview

Current Conditions

As of 7:00 AM EDT at Toronto Pearson International Airport:

• Temperature: 21.2°C

• Humidity: 79%

• Dew Point: 17.4°C

• Wind: South-southeast at 5 km/h

• Pressure: 102.2 kPa, falling

• Visibility: 16 km

• Condition: Mainly Sunny

• Humidex: 27°C

The city is basking in sunshine this morning, with a gradual build-up of haze expected through the afternoon. Winds will increase from the southeast to 20 km/h, helping to usher in even warmer air from the U.S. Midwest.

• High: 30°C

• Humidex: 37°C – oppressive and potentially hazardous heat

• UV Index: 8 – very high, full sun protection advised

Tonight

• Mainly cloudy, with haze lingering

• Light winds, becoming calm overnight

• Low: 20°C – another warm and muggy night

Tomorrow’s Forecast

Expected Conditions

Saturday, August 9

• Increasing cloudiness early in the morning, but no relief from the heat

• Hazy conditions throughout the day

• Winds becoming south at 20 km/h

• High: 32°C

• Humidex: 40°C – dangerously hot

• UV Index: 7 or high

Saturday Night

• Clear skies

• Low: 21°C

Sunday, August 10

• Sunny and extremely hot again

• High: 32°C

• Night: Cloudy periods with 30% chance of showers, low: 21°C

This heat wave remains in full swing through the weekend with minimal overnight cooling.

Wardrobe Recommendations

• Today & Weekend: Stick with light-colored, breathable fabrics, and wide-brimmed hats or sunglasses. Apply SPF 30+ sunscreen and reapply frequently.

• Avoid heavy or dark clothing, and stay in the shade or indoors during peak sun (11 AM to 4 PM).

• Stay hydrated and check on vulnerable individuals (seniors, young children, pets).

Weather Trivia

Did you know?
Toronto’s urban heat island effect makes overnight temperatures 3–5°C warmer than surrounding rural areas. With low winds and high humidity like we’re seeing this weekend, downtown areas may not drop below 22–24°C overnight, even when the official forecast calls for lows of 20–21°C.