**Trader sentiment for Hong Kong’s September 13 lowest temperature centers on 27°C as the leading outcome at 67% implied probability, followed by 26°C at 17.5%.** This positioning stems from the region’s typical late-summer tropical conditions, where high humidity, cloud cover, and frequent showers limit overnight radiative cooling. Official forecasts from sources such as the Hong Kong Observatory and global models consistently project nighttime lows in the mid-to-upper 20s Celsius amid easterly winds, scattered thunderstorms, and dew points near 24–26°C. These factors suppress temperature drops below seasonal baselines of roughly 25–27°C for September. Recent model runs show broad consensus on this range, with minimal disagreement and no incoming cold surge or clear-sky event that would drive sharper cooling. Traders appear to weigh the high likelihood of persistent moisture and cloudiness—common during the rainy season—against the slim chance of brief clear periods allowing a dip to 25°C or lower. As the day progresses toward resolution, any updated observational data on overnight cloud trends or wind shifts could refine these market-implied odds.