**Latest official forecasts from Environment Canada and supporting numerical models point to a daytime high of 16–17 °C under mainly sunny skies with light southerly winds, positioning 16 °C as the market favorite at 52 % implied probability.** Clear high-pressure conditions are limiting cloud cover and moisture, allowing moderate solar heating while autumnal temperatures and modest advection keep the peak from reaching the historical average of 17.1 °C. Current mid-afternoon observations near 13–14 °C and model consensus showing a narrow range around 15–16 °C explain why 15 °C holds 39.5 % support and why 17 °C remains at only 4.5 %. Traders are weighting the most recent model runs and station-specific criteria, with resolution likely hinging on the official maximum recorded at the primary Toronto observing site.