Traders see tight clustering around 14–16°C for Sao Paulo’s August 26 low because winter high-pressure systems and southerly cold-air advection are creating modest radiative cooling under variable cloud cover. Recent model consensus from meteorological centers shows overnight temperatures hinging on boundary-layer wind speeds and the precise timing of any frontal passage, which can shift minima by 1–2°C. Historical August baselines near 15°C provide context, yet current ensemble spreads reflect uncertainty in local urban heat retention versus clear-sky cooling rates. Tomorrow’s updated guidance will likely resolve whether conditions favor the lower or higher side of this narrow range.