Recent forecast guidance from models such as those informing AccuWeather places São Paulo’s August 9 maximum near the seasonal climatological average of 23–25 °C, with a cooler air mass and limited insolation keeping readings from climbing higher. The tight clustering of market-implied probabilities across 24 °C or below through 26 °C captures residual uncertainty from boundary-layer mixing, variable cloud cover, and any late-day warming that could push the peak by 1–2 °C. Historical August highs rarely exceed 27 °C under similar synoptic patterns, which explains the rapid decay in odds above 28 °C. Updated model runs and official observations on the morning of August 9 will be the decisive inputs for final resolution.