Recent forecast models from multiple sources indicate a cooler, rainier pattern for São Paulo on October 2, driven by increased cloud cover, southeasterly flow, and precipitation that limits daytime heating. This has concentrated market-implied odds around 19–20 °C as the most probable maximum, consistent with projected highs of 15–19 °C under overcast, showery conditions. Spring climatology shows typical October maxima near 24–25 °C, but the near-term synoptic setup favors suppression of warming, with model runs highlighting modest uncertainty in exact peak values depending on timing of showers and boundary-layer moisture. Updated numerical guidance over the next 48 hours will refine resolution criteria tied to official station observations.