**Persistent outer rainbands from Typhoon Dolphin, tracking north of Taiwan, are the dominant near-term factor moderating daytime heating in Taipei on August 9.** Official Central Weather Administration guidance and model consensus indicate increased cloud cover, scattered showers or thundershowers, and southeasterly flow that limits insolation and promotes evaporative cooling, keeping maximum temperatures aligned with the 30–33°C cluster where market-implied odds are most concentrated. Subtropical high pressure and the urban heat island effect normally support August climatological highs near 32–34°C, yet the typhoon’s influence introduces genuine uncertainty around whether brief clear intervals allow a 33–34°C spike or sustained precipitation caps readings at 30–31°C. Traders are weighting these variables against historical analogs of similar northern passages, with resolution hinging on the precise timing and intensity of rainfall during peak heating hours.