**Recent weakening of seasonal northeasterly winds has allowed warmer easterly flow to dominate Taipei, supporting market-implied odds that cluster around 25–27°C for the September 13 overnight low.** Official Central Weather Administration guidance and multiple forecast models indicate partly cloudy to mostly clear conditions with light easterly winds of 10–20 km/h, yielding projected lows of 24–26°C under moderate humidity near 70–90%. Scattered showers or thunderstorms, possible at 20–35% chance, introduce the main uncertainty by limiting radiational cooling if clouds persist overnight. This setup aligns with mid-September climatology, where average lows fall from ~26°C early in the month toward 24°C later, while the absence of strong monsoon surges or typhoon influences keeps temperatures from dropping further. Updated model runs and evening observations on September 12 will refine the precise minimum before resolution.