Singapore's tropical equatorial climate produces small diurnal temperature ranges, with August southwest monsoon conditions typically yielding overnight lows of 25–27°C amid high humidity and frequent showers. Drier-than-average conditions tied to a positive Indian Ocean Dipole have supported warmer nighttime temperatures in recent weeks, limiting radiative cooling under reduced cloud cover and lighter winds. The closely bunched market odds around 26–28°C reflect genuine uncertainty in nocturnal cooling rates, which hinge on the precise timing and intensity of afternoon/evening convection, cloud persistence into the night, and any sea-breeze moderation. Official forecasts from the Meteorological Service Singapore emphasize minimums near 25–27°C, but small shifts in these variables can easily separate the leading outcomes without altering the broader warm, humid pattern.