Northeasterly monsoon winds strengthening over northern Taiwan are the main driver behind market-implied odds favoring a 30°C high in Taipei on September 10, with showers and increased cloud cover expected to cap daytime heating. Central Weather Administration guidance and ensemble model consensus point to maxima near 27–30°C amid 70–90% rain probabilities and northeast winds of 10–20 km/h, a notable moderation from earlier-week readings that reached 31–33°C. These conditions align with the seasonal transition, where radiative cooling overnight and persistent moisture limit peak values, though minor forecast shifts in wind strength or timing could nudge outcomes toward 31°C or 29°C. Updated model runs and CWA briefings over the next 24 hours remain the key data points for traders.