Recent forecasts from Taiwan’s Central Weather Administration and global models point to overnight lows near 26–27°C for Taipei on August 23, consistent with seasonal averages under southwesterly monsoon flow and lingering moisture from Typhoon Dolphin’s recent passage. Widespread cloud cover, scattered showers or thunderstorms, and high humidity are expected to suppress nighttime radiative cooling and cap any significant temperature drop, keeping the minimum within the typical 25–27°C range. Trader positioning around the 21°C-or-below outcome at 48% implied probability appears driven by model uncertainty in short-range minimum-temperature guidance and the possibility of heavier convective activity enhancing local cooling, while clustered probabilities near 26°C reflect the baseline climatological expectation of limited diurnal range in late-summer subtropical conditions. Updated model runs and official briefings over the next 48 hours will likely refine these ranges ahead of market resolution.