**Singapore’s official forecast for the second half of August 2026 points to daily maximum temperatures of 33–34 °C on most days under prevailing southwest monsoon conditions, with occasional peaks near 35 °C.** This outlook from the National Environment Agency aligns closely with current market-implied odds favoring 33 °C (50.5 %) and 32 °C (30.0 %), reflecting trader consensus on typical monsoon-driven heating tempered by scattered showers. Recent observations reinforce the positioning: maximum temperatures exceeded 33 °C on nearly all days through mid-August, reaching 34.9 °C at Pulau Ubin on 14 August amid below-average rainfall and limited cloud cover. These drier, sunnier patterns enhance daytime solar heating while high humidity limits overnight cooling, keeping the daily range narrow and centered on 33–34 °C. For the specific date of 21 August, proximity to resolution and the absence of strong model signals for either significant cooling (via enhanced convection) or extreme heating (via clear skies and subsidence) keep probabilities concentrated around the 32–34 °C band. Updated short-range forecasts from the Meteorological Service Singapore or National Environment Agency over the next 48 hours will likely provide the next catalyst for any shifts in these market-implied odds.