Recent forecasts for São Paulo on October 3 indicate a recovering high near 21–24°C after cooler conditions on October 2, driven by the passage of a frontal system that increased cloud cover and moisture. Model consensus from sources such as the Met Office, INMET, and regional guidance shows variable timing of showers and breaks in cloud, which will determine peak solar heating and the exact daily maximum. Historical early-October averages hover near 22°C, with current patterns reflecting typical spring transition dynamics including sea-breeze effects and Atlantic high-pressure influence. Trader-implied probabilities cluster tightly around 20–23°C because small differences in convective timing or wind direction can shift the observed high by 1–2°C. Updated model runs and INMET briefings in the next 24–48 hours will refine these thresholds ahead of market resolution.