Japan Meteorological Agency observational data from Tokyo's Haneda Airport station, the market's resolution source via Wunderground, confirm a maximum temperature of 25°C reached in the late afternoon of April 11, 2026, under partly cloudy skies with light winds favoring daytime heating without excessive intensification. This aligns with spring climatology for Tokyo, where April highs typically average 19–23°C but occasionally peak at 25°C amid high-pressure influences. Trader consensus at 100% implied probability reflects near-certainty as the diurnal temperature cycle wanes post-sunset, with evening cooling expected. A realistic challenge would require an anomalous late-day heat burst exceeding 26°C, improbable given current model outputs from JMA and declining solar insolation, though final 00:00 JST observations will seal resolution.