Current ensemble forecasts from agencies like the Japan Meteorological Agency point to a Tokyo minimum near 23–25°C on August 5, aligning with the closely bunched market-implied odds around 22–25°C. Typical midsummer radiative cooling under partly cloudy skies and scattered showers limits overnight temperature drops, while high humidity and the urban heat island effect keep lows elevated above the long-term August average of roughly 24°C. Key differentiating variables include the exact timing and coverage of clouds—which reduce nocturnal heat loss—and any shift in steering winds that could allow slightly clearer conditions for greater cooling toward 22°C or trap more heat near 25°C. Updated model runs over the next 48 hours will refine these thresholds ahead of market resolution.