**Recent forecasts from the Japan Meteorological Agency and multiple models indicate a minimum temperature of 23–24°C in Tokyo on September 1, 2026, aligning closely with market-implied probabilities that concentrate on these outcomes (24°C at 41%, 23°C at 26.5%, 25°C at 18.5%).** Persistent late-summer warmth from a warm air mass south of the autumn rain front (秋雨前線) has kept overnight lows elevated, while increasing cloud cover and moderate humidity limit radiative cooling. Current conditions on August 30 show nighttime temperatures near 23–24°C with high humidity (85%+), setting up similar overnight minima. Model consensus points to mostly cloudy skies on the 1st with light rain possible, further moderating the diurnal range and supporting a low near the seasonal norm of ~22–23°C. The tight clustering of probabilities around 23–25°C reflects trader assessment of stable synoptic patterns, with lower odds on extremes due to the absence of strong cold advection or clear-sky radiative cooling that could push readings below 22°C. Upcoming JMA updates and refined model runs in the next 24–48 hours will likely refine these implied odds as the exact steering of the front and cloud trends become clearer.