**Trader consensus has converged on 22°C as the near-certain outcome for Tokyo’s highest temperature on June 15, 2026, reflecting the latest Japan Meteorological Agency short-range forecast and ensemble model guidance.** A modest subtropical ridge combined with lingering Baiu-season cloud cover is limiting solar heating, producing daytime maxima consistent with 21–22°C at the Otemachi observation site—the official resolution source. This aligns with early-June climatology when frontal activity often caps temperatures several degrees below the monthly normal of ~26°C. The market-implied probability above 99% for 22°C incorporates real capital at risk and accounts for minor remaining uncertainty in afternoon mixing or localized clearing. An unexpected rapid dissipation of cloud cover or a sharper ridge build could allow readings to reach 23–24°C, though current model consensus and ongoing JMA updates make such shifts unlikely before final observations are recorded.