Recent forecasts from multiple models indicate a rainy, cloudy day over Tokyo on September 29 driven by a moist northerly flow and associated frontal activity, keeping daytime highs suppressed near 22–23 °C. Persistent precipitation and high cloud cover limit solar heating, while light winds prevent significant mixing or warming, aligning with the near-even market-implied odds between 23 °C and 24 °C. Historical late-September climatology shows average maxima around 25 °C, so the current pattern represents a modest cool anomaly. Minor model spread in timing of heaviest rain or wind shifts could still nudge the observed peak by 1 °C, leaving room for resolution in either leading outcome as new runs become available.