Trader consensus on Polymarket has locked in 100% implied probability for a highest temperature of 33°C at Singapore's Changi Climate Station—the market's official resolution source—reflecting National Environment Agency (NEA) observational data confirming this peak amid typical April warmth averaging 32°C daily maxima. Real-time monitoring throughout April 29 showed temperatures topping out at 33°C before afternoon thundery showers and partly cloudy conditions suppressed further rises, aligning with NEA forecasts of 25–34°C highs influenced by seasonal southwest monsoon onset and urban heat island effects moderated by humidity above 60%. While inherent sensor precision and final data validation carry minimal uncertainty, a rare late-day heat burst or post hoc measurement adjustment could theoretically challenge this, though traders see negligible risk as the day concludes.