**Persistent warm, humid conditions from a southerly air mass and limited overnight radiative cooling are keeping market-implied odds tightly clustered around 48–50% for minimum temperatures in the 19–24°C range on September 2, 2026, with 25°C+ also at 50%.** Official forecasts from Environment Canada and other models show daytime highs near 28°C under partly cloudy skies with a 60% chance of showers, followed by overnight lows of 18–21°C. High dew points near 20–22°C and elevated humidity (often 85–95%) from recent heavy rainfall reduce the diurnal temperature range by suppressing clear-sky cooling. Light to moderate winds and possible lingering cloud cover or showers further limit heat loss, supporting the elevated minimums implied by trader consensus. The narrow spread among leading outcomes reflects model uncertainty in exact cloud timing, precipitation amounts, and boundary-layer mixing over the next 48 hours. Colder outcomes below 18°C carry lower probabilities (43.5% or less) because a strong cold front or clear, calm conditions would be required to allow greater radiational cooling—scenarios not favored in current guidance. Historical September normals for Toronto lows near 15–16°C provide context, but the current pattern deviates warmer due to the ongoing late-summer warmth. Updated model runs and official briefings ahead of September 2 will be key for any shifts in these odds.