Persistent cloud cover, light rain, and northerly to northeasterly winds are suppressing daytime warming in Tokyo, positioning 23–24°C as the leading outcomes with combined market-implied odds near 94%. Official forecasts from multiple models show an afternoon peak near 23–24°C under overcast skies and high humidity, well below the September climatological average high of about 27°C. Recent observations confirm temperatures climbing only gradually from morning lows around 19–21°C, with precipitation and limited solar insolation preventing stronger heating. Updated model runs through the day will refine exact maxima before resolution, though current consensus favors the narrow 23–24°C range.