Latest numerical weather prediction models from Environment Canada and supporting global ensembles indicate a daytime maximum near 27–28°C at Toronto Pearson International Airport on August 14, underpinning the close market-implied odds between those two outcomes. A broad ridge of high pressure supports mostly sunny skies and light southerly flow, with climatological August highs averaging 25–27°C providing historical context. Minor model disagreements arise from uncertain boundary-layer mixing, potential Lake Ontario lake-breeze moderation, and the chance of isolated afternoon cumulus or weak convection that could trim peak readings by 1°C. Official resolution depends on the highest 24-hour observation at the designated station, with final data typically posted within 24 hours after the period ends.