Current forecasts from the Japan Meteorological Agency and global models indicate Tokyo overnight lows on July 11 will likely range from 22–24°C under a subtropical ridge with partly cloudy skies, light southerly flow, and minimal radiative cooling. Above-normal sea-surface temperatures sustain elevated baseline warmth, while urban heat-island effects and high humidity further limit temperature drops. Small differences in cloud persistence, wind strength, or localized shower timing can shift the exact minimum by 1–2°C, explaining the tight clustering of market-implied odds around 24–26°C. Updated model runs and official guidance ahead of the date will refine these variables.