Prevailing dry conditions under the Southwest Monsoon, with southeasterly to southwesterly winds, have supported elevated daytime temperatures across Singapore on September 5, 2026. Official forecasts from agencies including the Meteorological Service Singapore projected daily maxima between 33°C and 35°C amid fair and occasionally windy weather, aligning with historical September averages near 31.6°C but elevated by below-average rainfall and persistent heat. Multiple models and station observations converged on a peak air temperature of 33°C, driving the market-implied odds near certainty for this outcome. Realistic challenges include localized thundery showers or measurement differences across official stations that could shift the recorded high by 1°C.