
Toronto's Late-Summer Heatwave: Get Ready for Sunny Skies!
2025-09-15
Author: Sophie
Toronto is gearing up for an exhilarating week of late-summer sunshine, as forecasts predict a delightful rise in temperatures that's set to blow past seasonal norms!
According to Environment Canada, the temperature is expected to soar to 24 °C on Monday and Tuesday, hitting an impressive 26 °C on Wednesday, and peaking at a sizzling 28 °C this Thursday. With mostly clear skies, this week promises to deliver the warmth we often long for before autumn takes over.
At night, you can expect mild temperatures in the mid-teens, eliminating that crispness usually associated with the early signs of fall. However, as the weekend approaches, there may be a slight dip in temperatures, bringing overnight lows around 9 °C, although no rain is on the horizon just yet.
Typically, mid-to-late September in Toronto ushers in cooler weather, but recent climate data tells a different story—historically, daytime highs during this period hover around 22 °C with nighttime lows about 14 °C. While warm spells are no rarity, sustained highs in the upper 20s at this time of year are indeed a special treat.
For context, just last year, Toronto experienced September highs only ranging from 19 °C to 23 °C, along with several rainy days. Even in 2024, when September kicked off with warmth, temperatures only brushed 25 °C once during this timeframe. If this week’s temps hold, we could be looking at one of the warmest mid-September stretches in Toronto's recent history!
And here’s the kicker—if Thursday’s lofty forecast of 28 °C is achieved, it will be tantalizingly close to the historical record of September 18, which soared to 31.1 °C back in 1942.