Recent Japan Meteorological Agency forecasts project a daytime high near 32°C in Tokyo for August 20 under persistent Pacific high pressure, which promotes subsidence, clear skies, and strong solar heating typical of late-summer climatology. Urban heat island effects and high humidity further support temperatures in the 30–33°C range, while any increase in cloud cover or sea breezes could cap the peak one to two degrees lower. With multiple ensemble runs clustered around this value and only modest day-to-day variability expected this close to the event, traders assign nearly equal probability across 28–32°C outcomes, reflecting the narrow but still uncertain envelope of possible maximum temperatures.