The market-implied odds reflect official temperature observations from the Korea Meteorological Administration confirming a daily maximum of 27°C in Busan on September 25. Late-September climatology for the region typically features highs near 25–28°C under transitional autumn patterns, with minimal diurnal variability once the peak is reached. Current synoptic conditions, including stable high pressure and light southerly flow, have produced no significant deviations from model consensus runs that locked in this exact threshold. Only an unprecedented station calibration error or localized microclimate anomaly could alter the recorded high, scenarios with negligible historical precedent in verified data.