Singapore's equatorial location drives consistently high solar heating during the May inter-monsoon period, with climatological daily maxima typically clustering between 31°C and 33°C at official stations like Changi. Trader pricing around these levels stems from ensemble forecast uncertainty in afternoon thundery shower timing and coverage, which frequently develops from sea-breeze convergence and caps further warming through increased cloud cover and evaporative cooling. Recent model runs show modest spreads in predicted peak temperatures due to variable low-level moisture and wind patterns, keeping the 31–33°C outcomes closely competitive while lower and higher extremes remain improbable given historical May baselines. Updated numerical guidance from the Meteorological Service Singapore in the next 24–48 hours will likely narrow these probabilities ahead of resolution.