**Latest short-range forecast models from Environment Canada and supporting agencies indicate a peak temperature in Toronto on August 5 likely falling in the 28–30 °C range, with the market-implied 29 °C outcome holding the clearest edge at 34.5 %.** A lingering warm, humid air mass combined with light southerly flow and limited cloud cover is supporting modest daytime heating, while any weak frontal passage or increased mixing could cap the high near 28 °C. Conversely, stronger subsidence or clearer skies could push readings to 30 °C. Historical August climatology for Toronto centers near 26–27 °C, so current conditions reflect a modest positive anomaly. Model spread remains the dominant uncertainty this close to the event, with the next official guidance updates expected to sharpen resolution thresholds. Traders are pricing the tight clustering around these three outcomes because small differences in boundary-layer moisture and insolation timing will determine the final maximum.