Forecast models for Taipei on September 16 show maximum temperatures clustered between 26–29°C amid light rain, high humidity near 70–80%, and easterly winds of 10–15 km/h that limit daytime heating. Cloud cover from a passing frontal boundary or residual monsoon moisture reduces incoming solar radiation, keeping peaks below the late-summer climatological average of roughly 30°C. Minor differences in model timing of showers and boundary-layer mixing produce the tight spread across 26–32°C outcomes, with traders assigning roughly equal implied probabilities to each. Updated runs from agencies such as the Central Weather Administration will refine the exact peak as the 48-hour window closes.