**Persistent cloud cover, widespread precipitation, and northeasterly flow from lingering low-pressure influences and typhoon outer bands are the dominant factors capping daytime heating in Taipei on September 6.** Official advisories highlight heavy rain potential across northern Taiwan, with models showing 20–35+ mm of accumulation and high humidity (often 85–95%) that limits solar insolation and promotes evaporative cooling. This setup favors maximum temperatures clustered around 26–30°C rather than the seasonal September average near 31°C, explaining why trader consensus concentrates on 27–29°C outcomes (over 60% combined implied probability). Model runs diverge modestly on exact timing and intensity of showers versus partial clearing, creating the tight spread between 27°C, 28°C, and 29°C. Wind speeds of 5–10 km/h from the northwest or west add further mixing that prevents localized warming. Resolution will hinge on verified observations from Central Weather Administration stations, with the most recent forecast updates likely to refine odds ahead of the daily high.