Recent forecasts from Environment Canada and GFS models indicate a northwest flow of cooler air combined with clear overnight skies will drive radiative cooling, positioning Toronto’s minimum temperature on October 5 near 5–8 °C. This aligns with the seasonal decline toward the 1991–2020 average low of 9.9 °C while exceeding the historical record low of −2.2 °C. Trader consensus reflected in the elevated probabilities for 10–12 °C outcomes likely incorporates uncertainty in urban heat-island effects at official stations versus suburban sites, plus minor model spread in wind speed and cloud cover that could limit cooling. Updated NWP runs and any late-day observations will refine these implied probabilities ahead of resolution.