Traders have converged on a 23°C daily maximum for Tokyo on September 29 due to real-time observations from the Japan Meteorological Agency confirming that peak under persistent heavy rain and overcast skies. Multiple forecast models aligned on suppressed temperatures near 22–23°C, consistent with the season’s climatological transition and strong northeasterly flow bringing cooler marine air. This outcome reflects the market’s aggregation of verified station data rather than uncertain projections. A late-day clearing that allowed brief solar heating or an unreported microscale spike above the official threshold could theoretically alter resolution, though current monitoring shows negligible probability of such shifts before final verification.