Persistent cloud cover, widespread showers, and high humidity are limiting daytime solar heating and keeping maximum temperatures in Taipei near or below seasonal norms for early September, producing the tight clustering of market-implied probabilities around 29–31 °C. Official Central Weather Administration guidance and ensemble forecasts show highs of 27–30 °C under mostly overcast skies with light variable winds, while scattered thunderstorm timing and intensity introduce model-to-model spread that prevents any single outcome from exceeding roughly 28 % implied probability. Light winds and saturated boundary-layer air further suppress peak readings by enhancing evaporative cooling, a pattern consistent with the active monsoon trough influencing the region.