**Singapore's equatorial location and ongoing southwest monsoon sustain warm, humid nights with limited diurnal cooling, keeping minimum temperatures typically near 25–27°C.** Persistent southeasterly winds promote mixing that reduces radiative cooling, while high humidity and variable cloud cover from localized thundery showers further moderate overnight lows. August 2026 data show most nights remaining above 27°C amid below-average rainfall and elevated daytime maxima, though occasional clearer periods have allowed brief dips to 26°C. Forecast models indicate light winds and scattered convection on August 25 could produce minor variations around 26–28°C, with uncertainty hinging on exact timing of any showers versus clear-sky cooling. This narrow range underpins the closely matched market-implied probabilities between cooler outliers and warmer baselines.