Northeasterly winds persisting across northern Taiwan are the dominant factor moderating temperatures and supporting the market's heavy weighting toward a 31°C high for Taipei on September 18. Official Central Weather Administration guidance and multiple forecast models indicate partly cloudy conditions with scattered showers possible, which limit afternoon heating and keep daytime maxima in the 28–32°C range, consistent with the implied probabilities clustering around 30–32°C. High humidity and cloud cover further cap peaks, aligning with mid-September climatology of roughly 31°C averages for the city. Model consensus remains tight but could shift with any delay in shower timing or changes in wind strength, with updated runs from agencies like the CWA expected to refine the outlook ahead of market resolution.