**Current forecasts and climatological context point to a minimum temperature around 26–27°C on September 11, 2026, consistent with the ongoing Southwest Monsoon and below-average rainfall outlook.** Official guidance from Singapore’s Meteorological Service indicates minimums are likely to stay above 27°C on most nights during the first half of September, driven by southeasterly to southwesterly winds, relatively dry conditions, and limited nocturnal radiative cooling under humid, often cloudy skies. Historical September averages at Changi show a mean daily minimum of 25.2°C (1991–2020), with nighttime lows rarely dropping below 23–24°C even in drier periods. Key differentiating factors include cloud cover and shower timing, which modulate longwave radiative loss, and boundary-layer moisture that suppresses cooling rates. Recent model runs and short-range forecasts show lows near 26–27°C (roughly 79–81°F), with localized thundery showers possible in the afternoon but limited overnight impact. The market’s closely matched leading outcomes (31°C or higher at 45.0% and 21°C or below at 41.5%) reflect uncertainty around exact nocturnal conditions and measurement precision at official stations, though sustained dry monsoon flow makes extremes in either direction less probable than near-climatological values around 25–27°C. Updated forecasts closer to the date will provide the clearest signals for resolution.