**Recent model consensus points to overnight lows near 27°C on September 1, 2026, driving the market’s strongest implied probabilities for 27°C (45%) and 28°C (34.5%).** Singapore’s equatorial climate produces modest diurnal ranges, with typical September minimums averaging 25–26°C at Changi station amid high humidity and frequent convective activity. Current forecasts from multiple sources show early-morning temperatures bottoming out around 25–27°C under partly cloudy skies and light southerly winds, with scattered showers unlikely to produce significant radiative cooling. The slight upward tilt toward 27–28°C in trader sentiment aligns with the ongoing southwest monsoon pattern, which maintains moist air masses and limits clear-sky cooling. Historical data indicate that sustained lows below 25°C require stronger northerly surges or prolonged clear conditions, neither of which appear imminent. Upcoming official updates from Singapore’s National Environment Agency and refined numerical weather prediction runs over the next 48 hours will provide the clearest signals for any late adjustments in these probabilities.