Recent forecast guidance from multiple meteorological models points to an overnight minimum near 21–23°C in Taipei on September 17, driven by clear-to-partly cloudy skies, moderate easterly winds of 4–7 m/s, and typical radiative cooling under a stable high-pressure regime. These conditions limit cloud insulation while allowing efficient heat loss after sunset, with dew points around 20–21°C moderating further drops. Key variables differentiating the closely matched market outcomes include slight variations in cloud cover timing, local urban heat-island effects, and minor model spread in boundary-layer mixing; stronger winds or increased humidity could raise the minimum by 1–2°C, while clearer skies and lighter winds favor the lower end of the range. Updated model runs and official observations through the night will refine resolution criteria for the daily low.