Current forecast consensus from Environment Canada and numerical models centers the overnight minimum near 19°C for Toronto on August 30, explaining the closely matched market-implied odds clustered around 18–20°C. Southwesterly flow and increasing cloud cover with a 60% chance of showers will suppress radiative cooling overnight, while modest warm advection from upstream air masses sustains higher dew points and limits temperature drops. Model spread in precipitation timing and boundary-layer mixing creates the primary uncertainty differentiating these outcomes, with drier scenarios potentially allowing brief dips toward 18°C and heavier rain or sustained winds holding readings near 20°C. Updated model runs and official briefings through the evening will likely refine these probabilities ahead of resolution.