Singapore's tropical climate features consistently high temperatures year-round, with April typically among the hottest months as the region transitions into the southwest monsoon season. The question asks whether the highest temperature on April 18, 2026 will not exceed 25°C, which would represent notably cool conditions for Singapore during this time of year. The current odds at 0% suggest that market participants view this outcome as extremely unlikely, reflecting well-established April weather patterns where daily maximum temperatures in Singapore typically range between 29°C and 34°C. For the market to resolve YES, the region would need to experience unusual meteorological conditions—such as sustained heavy rainfall, dense cloud cover, or other atmospheric factors that significantly suppress daytime temperatures below seasonal norms. Despite the extremely low YES odds, the market maintains substantial liquidity and trading volume, indicating active participation from traders interested in weather prediction market outcomes. The market ultimately resolves based on the official maximum temperature recorded in Singapore on April 18 by the Meteorological Service Singapore, with the YES outcome winning if the recorded temperature remains at or below 25°C.