Close trader consensus between 25°C and 26°C for Toronto’s August 20 maximum reflects lingering uncertainty in short-range model guidance, with ensemble spreads driven by variable cloud cover, timing of any weak frontal passage, and boundary-layer moisture from recent isolated thunderstorms across southern Ontario. Environment Canada and regional numerical forecasts indicate daytime highs near the long-term August average of 24–25°C, tempered by southwesterly flow that limits strong warming while supporting modest humidex values around 30. Minor shifts in predicted insolation or dewpoint advection over the next 12–18 hours could easily tip the observed high between these two bins, consistent with typical late-summer model error at this lead time.