From Cool Mornings to Summer Vibes by Afternoon
TORONTO – WEATHER – It’s one of those rare and wonderful Toronto mornings that tricks you into thinking fall is here—until the sun turns up the heat and suddenly it’s patio season again. As we roll into mid-September, the city is basking in a stretch of unseasonably warm, mostly sunny weather that’s perfect for soaking up those golden rays before the sweaters take over.
Morning Sunshine and a Warm Finish
At 7:00 AM EDT, conditions at Toronto Pearson International Airport were mainly sunny with a refreshing temperature of 14.5°C. The humidity was at 73%, offering a crisp, breathable start to the day. A northerly wind at 15 km/h adds a bit of a breeze, while visibility is excellent at 24 km. The barometric pressure is at 102.2 kPa and rising, a good sign for clear skies—at least for now.
But don’t let the cool air fool you. Toronto is heating up fast, with today’s high expected to reach a balmy 25°C. Thanks to the added moisture in the air, the humidex will make it feel closer to 28°C. It’s a good day to be outdoors—but don’t forget your sunscreen, with the UV index reaching a high 6. That fall sun still packs a punch!
For the curious weather watchers, Toronto’s historic high for September 11 is 30.6°C, while the record low sits at a chilly 5.1°C. We’re playing it nicely in the middle this year, leaning toward the warm side.
Clear and Calm Tonight
This evening brings partly cloudy skies with temperatures dipping to a mild low of 13°C. A great night for a stroll, a dinner al fresco, or one last scoop of gelato before the chill of autumn inevitably arrives.
Friday Holds the Sunshine – Showers Lurk in the Wings
Friday, September 12, will be another pleasant day with a mix of sun and cloud, a daytime high of 23°C, and a humidex of 26. The UV index remains high at 6, so pack those sunglasses if you’re lunching outdoors. Friday night brings cloudy periods, with an overnight low of 15°C—nothing to complain about for mid-September.
However, the weekend begins to turn the seasonal page. Saturday, September 13, brings cloudy skies and a 30 percent chance of showers, with a still-comfortable high of 22°C. Rain becomes more likely Saturday night, with showers and a low of 15°C.
Sunday, September 14, looks like a full-on grey day, with cloudy conditions and a daytime high of 21°C, settling into another cloudy night at 14°C. Not a washout, but definitely more umbrella-worthy than the sun-splashed days leading in.
What to Wear?
Today is ideal for short sleeves and light fabrics, with a light jacket or cardigan for the morning and evening chill. Sunglasses are essential, and maybe tuck some sunscreen into your bag—your skin will thank you. Rain gear isn’t necessary just yet, but by Saturday it might be time to bring out the umbrella.
Weather Trivia: TDot’s Microclimate Quirks
Did you know Toronto’s urban heat island effect can make the downtown core several degrees warmer than surrounding areas? All that concrete and asphalt absorbs the sun during the day and slowly releases heat through the night—meaning a sunset by the lake can feel entirely different than one in North York or Scarborough.
