Singapore’s equatorial location and prevailing southwest monsoon conditions sustain stable overnight temperatures, with official forecasts from the Meteorological Service Singapore and NEA consistently projecting minimums at or above 27 °C for September 20. Recent observations at Changi and other stations show nighttime readings holding near 27–28 °C amid partly cloudy skies and scattered thundery showers that limit radiational cooling. Historical September climatology places average lows around 25 °C, yet the current fortnight’s warm, humid pattern—driven by regional wind convergence and elevated dew points—has kept readings elevated, aligning trader consensus with the 27 °C threshold. No significant cold-air intrusions or clear-sky radiative events have emerged to shift this outlook.