Recent model runs from regional meteorological agencies show Sao Paulo under a stable high-pressure ridge promoting subsidence, clear skies, and enhanced solar heating, supporting maximum temperatures clustered around 25–27 °C for August 7. This setup yields light surface winds and reduced humidity that limit evaporative cooling, while subtle differences in low-level moisture advection and afternoon cloud development among ensemble members create the tight spread between the 26 °C (25 %) and 25 °C (23 %) leaders. Historical August climatology averages near 24 °C, so the current modest positive anomaly reflects seasonal persistence rather than extreme forcing. Updated satellite and surface observations through midday will refine boundary-layer mixing and peak insolation, likely tightening the market-implied distribution before resolution.