Hong Kong Observatory forecasts indicate a minimum temperature of 27°C for September 25 under a strengthening high-pressure system, with light easterly winds, low rainfall probability, and partly cloudy overnight conditions limiting radiative cooling. This aligns with observed evening temperatures near 26–28°C and typical late-September climatology for the region, where urban heat and marine influence moderate overnight lows. Trader consensus heavily favors the 27°C outcome at over 90% implied probability due to this stable pattern and model agreement. A shift in steering flow introducing more cloud cover or stronger winds could allow a modest additional drop toward 25–26°C, though current observations and guidance show limited scope for such change before resolution.