**Current forecast models indicate overnight lows for September 10 ranging from roughly 24–28°C, with official Singapore Meteorological Service guidance emphasizing minimums above 27°C amid prevailing southwest monsoon conditions.** Numerical weather prediction outputs, such as those from Yr.no, show a brief dip toward 24°C in the early morning hours under increased cloud cover and light showers, while other sources like WeatherBug and Met Office project 27–28°C. This spread in model guidance, combined with typical September climatology where nocturnal temperatures rarely fall below 25°C without strong radiative cooling or widespread rain, underpins trader positioning. The elevated probability on 21°C or below reflects market pricing of downside risk from any intensification of thundery activity or clearer skies allowing greater heat loss, even as baseline expectations and recent dry conditions favor warmer readings near 26–27°C. Resolution will hinge on the official 24-hour minimum reported for the period, with fresh model runs and local observations likely to refine odds ahead of the close.