Recent forecasts from multiple models indicate Sao Paulo's overnight low on October 15 will likely settle near 18–19°C amid widespread cloud cover, scattered showers, and light variable winds. These conditions suppress radiative cooling and keep dew points elevated around 17–18°C, limiting temperature drops despite the spring season's typical clear-sky potential for lower readings. Historical mid-October climatology shows average lows near 17°C, but the current moist, stable air mass—tied to a lingering trough—favors values at or above that baseline. Trader emphasis on 16–17°C reflects uncertainty in exact cloud persistence and urban heat island effects, with resolution hinging on official overnight observations from INMET stations.