Trader consensus on Polymarket reflects tight uncertainty in Singapore's Meteorological Service forecasts for April 18, with daily maximum temperatures likely ranging 33–35°C amid onset of inter-monsoon conditions bringing afternoon thundery showers. Increased convective activity and cloud cover could suppress peaks to 31–32°C if widespread, while brief sunny intervals might push toward 33°C, aligning with April's climatological average high of about 31.5°C and recent early-month patterns of hot days exceeding 35°C occasionally. High humidity and urban heat island effects amplify heat stress, but shower timing remains the key differentiator. Watch for MSS 4-day outlook updates tomorrow, as model runs often refine short-range predictions.