Recent forecasts from multiple meteorological models indicate mostly sunny skies and light northerly winds over São Paulo on August 27, supporting surface heating under dry late-winter conditions after several cooler, cloudier days with highs near 20–24°C. Official guidance and ensemble runs converge on a maximum near 26–27°C, with clear conditions and low humidity favoring the upper end of typical August variability around the long-term average of 23°C. Market-implied odds favor 28°C as the leading outcome because traders appear to price in modest upside from model bias or localized urban heat effects, while the 29°C probability reflects uncertainty in peak insolation timing before any evening stabilization. Updated model runs and surface observations on the day will determine final resolution against the official station reading.