The strengthening northeasterly monsoon, which intensified over northern Taiwan on October 5 with heavy rain advisories from the Central Weather Administration, is the main driver pushing market-implied odds toward a tight cluster around 27–29°C for Taipei’s October 7 high. Cooler maritime air, increased cloud cover, and lingering moisture from the system are expected to limit daytime warming compared with early-October norms near 28–30°C, while any partial clearing or reduced wind could allow brief afternoon peaks near the upper 20s. Model consensus from CWA and international sources shows highs of 24–26°C under mostly cloudy skies with isolated showers possible, creating genuine uncertainty around exact maxima that traders are pricing through closely matched probabilities for 27°C, 28°C, and 29°C. Radiative cooling overnight may further influence the daily range, with fresh forecast updates due ahead of resolution.