Taiwan’s Central Weather Administration forecast of a 30°C daily maximum in Taipei on May 16 drives the market’s near-100% implied probability for that exact outcome. A strengthening subtropical ridge is steering moist southerly flow across the region, while partly cloudy skies allow sufficient surface heating to reach but not exceed this threshold. Historical May climatology for northern Taiwan supports this range, with typical highs near 29–31°C under similar synoptic patterns. Real-time observational data from official stations continue to align with ensemble model consensus showing limited potential for additional warming. A rapid clearing of cloud cover or an unforecasted shift in wind direction could still push readings to 31°C or higher before the daily peak is recorded.