Latest forecasts from Environment and Climate Change Canada and supporting models indicate Toronto will likely see a daytime high near 25–26°C on August 15 under partly cloudy skies and moderate southerly flow, keeping market-implied odds tightly split between those two outcomes. A lingering upper-level ridge supports modest daytime warming while preventing stronger advection of hotter air from the southwest, and any increase in cloud cover or timing of peak insolation could shave the maximum by 1°C. Historical August climatology for the region centers around 25°C, providing a baseline traders reference against current model consensus. Final resolution hinges on official observations at Pearson Airport, with updates to afternoon model runs the key near-term catalyst for any shift in trader positioning.