**Singapore’s equatorial climate keeps daytime highs consistently near 30–32°C in August, driven by high solar insolation, elevated humidity, and the prevailing southwest monsoon.** The National Environment Agency’s late-July outlook for the first half of August highlighted 33–34°C maxima on most days under fair, occasionally windy conditions with only localized afternoon thundery showers—factors that reduce cloud cover and support stronger surface heating. Recent observations (e.g., 32.3°C on 8 August) and short-range model guidance for 14 August cluster around 31–33°C, aligning with the market’s heavy weighting on those two outcomes. Variability stems mainly from the timing and coverage of showers versus breaks of sunshine; a drier, windier day pushes the daily maximum toward 33°C, while more widespread convection caps it nearer 31–32°C. Historical August averages (roughly 30–31°C) provide the baseline, but the current monsoon pattern has shifted the distribution slightly higher, explaining why traders assign the bulk of probability to 32°C and 33°C.