Recent model consensus from global ensembles points to scattered thunderstorms and persistent cloud cover over São Paulo on October 14, keeping maximum temperatures tightly clustered near 26–28°C and explaining the market’s near-even split between 26°C and 27°C outcomes. Afternoon convection, driven by seasonal moisture and modest instability, is expected to limit solar heating after any morning clearing, while steering winds and timing of rain bands introduce the main forecast spread. Historical October maxima in the city average around 25–27°C, providing context for why traders assign low probability to 30°C-plus extremes. Updated runs from CPTEC and international centers later today will likely refine the precise peak before official INMET observations resolve the market.