**Singapore’s equatorial climate produces a narrow diurnal temperature range, with September minimums typically averaging 25.2°C at Changi and rarely deviating far from 24–27°C.** On September 2, 2026, official forecasts from multiple sources point to overnight lows near 26–28°C (roughly 79–82°F) under partly cloudy to mostly clear conditions with light southeasterly winds and limited rainfall, consistent with the southwest monsoon’s relatively drier pattern. Trader consensus clusters tightly around 24–27°C because small differences in cloud cover, humidity (often 70–90% at night), and sea-breeze strength can shift radiative cooling by 1–2°C. High humidity and urban heat-island effects limit how much the surface cools after sunset, while any increase in low-level clouds or calm winds would favor the lower outcomes (24–25°C) by enhancing longwave trapping. Clearer skies and modest wind would support the higher side (26–27°C). No major recent anomalies or model consensus shifts have altered this baseline; long-range outlooks align with climatology. The even split across leading outcomes reflects genuine forecast uncertainty in nocturnal boundary-layer processes rather than any strong directional signal.