Official forecasts from the Japan Meteorological Agency and supporting ensemble models project an overnight low of 16°C for Tokyo on June 6, reflecting typical early-summer conditions with moderate humidity, light winds, and no significant frontal systems or clear-sky radiative cooling expected. This aligns with climatological baselines for early June, when minimum temperatures commonly range 15–19°C amid the transition toward the rainy season. The market’s near-certain consensus on 16°C as the lowest temperature incorporates real-time observational data and model agreement, leaving limited room for deviation. Scenarios that could realistically alter the outcome include a stronger-than-forecast nocturnal cooling event or rapid advection of cooler air, though current guidance shows low probability for such shifts before resolution.