Current forecasts from Environment Canada and other models indicate Toronto's minimum temperature on September 27 will likely fall between roughly 9–14°C, driven by partly to mostly cloudy overnight conditions that limit radiative cooling alongside moderate northeast winds. This places the outcome near historical averages for the date while creating balanced market-implied odds between sub-6°C and 16°C-plus extremes due to typical short-range model spread in boundary-layer temperatures and cloud timing. Traders weigh official guidance against ensemble variability, with resolution hinging on precise overnight lows at stations like Pearson Airport rather than daytime peaks near 21–23°C. Updated model runs and observations over the next 48 hours will narrow the range ahead of the calendar-day minimum.