Current forecasts from multiple models indicate a Toronto minimum temperature near 15–16°C on September 15, driven by southerly flow and increasing cloud cover that limits overnight radiative cooling. Trader sentiment remains closely split between an 8°C-or-below outcome and 18°C-or-higher because short-term model spreads show potential for stronger northerly advection or clearer skies that could shift the low by several degrees. Recent high-pressure building to the north and a trailing frontal system introduce the key variables of wind direction and timing of any showers, both of which directly influence minimum readings. Updated runs from Environment Canada and global ensembles over the next 24–48 hours will likely tighten the range ahead of market resolution.