Recent forecasts from multiple models indicate Sao Paulo will see mostly clear skies and light winds on September 26, supporting moderate overnight radiative cooling after daytime highs near 32°C. Current consensus points to a minimum around 18–19°C, consistent with September climatology adjusted for the observed warmer-than-average pattern this month, though model spreads create uncertainty between 16–20°C outcomes. High-pressure dominance and low humidity favor clearer conditions that could push the low slightly lower if winds remain calm, while any increase in cloud cover or moisture advection would moderate the drop. Traders appear to weigh these variables heavily, with closely matched probabilities reflecting the narrow range typical for the city's urban heat island and the final 24-hour forecast updates expected before resolution.