Recent forecasts from multiple models and Taiwan's Central Weather Administration indicate a daytime high near 30–31°C in Taipei on September 18, driven by northeast monsoon flow, moderate humidity around 70–80%, and partly cloudy skies with limited afternoon heating. Light easterly winds and a low chance of scattered showers should prevent significant cooling or extreme warming, aligning with late-summer climatology where daily maxima typically range 29–32°C absent strong synoptic forcing. Model consensus supports the market's leading outcomes at 31°C and 32°C, though localized urban effects or revised afternoon observations could shift the exact peak by 1°C. Updated agency briefings tomorrow morning represent the key near-term catalyst for any probability adjustments.