**Trader consensus heavily favors a 21°C minimum on September 9 in Toronto, with an 81% implied probability, driven by persistent cloud cover, showers, and thunderstorms that limited overnight radiative cooling.** Environment Canada and local forecasts projected an overnight low near 17–21°C amid humid, overcast conditions with southwest winds gusting to 40 km/h and rainfall totals of 10–20 mm. These factors—combined with high humidity near 90%—maintained elevated surface temperatures, preventing the typical drop toward the 15°C September climatological average. Observed evening readings around 21–22°C at Pearson Airport aligned with model consensus for a warm minimum. Upcoming official station data from Environment and Climate Change Canada will confirm the exact low, with any revision hinging on precise hourly observations during the overnight period.