Approaching Typhoon Dolphin, currently east-northeast of Taipei and tracking toward northern Taiwan, represents the dominant driver of trader sentiment for the August 9 maximum temperature. Official Central Weather Administration guidance indicates increased cloud cover, scattered to heavy showers, and moderating winds that suppress daytime heating, with forecast highs centered on 27–31°C. This contrasts with typical August climatology of 32–34°C highs under Pacific high pressure. Recent model consensus and the storm’s outer circulation favor outcomes clustered at 31–32°C, while path uncertainty and potential timing shifts keep 30°C and 33°C viable. Historical analogs of typhoon-influenced days show similar 2–4°C cooling relative to seasonal baselines, aligning with the tight probability distribution around these thresholds.