Trader consensus on a 22°C maximum in Tokyo on October 4 reflects verified surface observations from Japan Meteorological Agency stations, which recorded a daily peak of 22°C amid persistent cloud cover, light northeast winds around 5–10 km/h, and stable high pressure. These conditions suppressed afternoon heating typical of early autumn, matching ensemble model guidance and historical October baselines near 23°C. The 100% market-implied odds indicate near-complete resolution confidence once final hourly data close. Only an unexpected post-analysis correction to official records or a localized station anomaly could alter the outcome, though cross-verification across multiple sites makes such shifts improbable.