Official forecasts from Environment Canada and global models project a Toronto high of 15–16°C on October 5, driven by northwesterly winds of 15–20 mph gusting higher that advect cooler air behind a recent frontal passage, combined with mostly clear skies and limited daytime mixing. This autumnal pattern sits below the 1991–2020 average high of 17.4°C. The near-even market split between 15°C and 16°C stems from small uncertainties in peak boundary-layer warming, exact wind timing, and minor cloud variations across model runs; stronger sustained winds or earlier clearing could push the reading to 16°C, while faster cooling or higher gusts favor 15°C. No major data shifts have occurred in the past 48 hours.