Current ensemble forecasts for São Paulo on October 10 indicate afternoon highs most likely between 29–32°C, driven by seasonal spring warming, above-average recent temperatures, and moderate moisture supporting scattered thunderstorms. Model consensus shows peak readings sensitive to cloud timing and convective initiation, with early storms potentially capping maxima near 29°C while clearer conditions allow 31–32°C under urban heat island influence. Historical October averages hover near 27°C, yet 2026 patterns reflect elevated baseline warmth. Traders weigh these variables against official INMET updates and refined model runs expected before resolution, creating tight spreads around the 30–31°C outcomes.