Northeast monsoon flow and associated northerly winds are the dominant driver positioning 24–25 °C as the clear market leaders for Hong Kong’s official lowest temperature on 5 October 2026, with current Hong Kong Observatory readings showing overnight minima near 23.8–25.7 °C across stations and forecasts converging on a daily minimum in that narrow band. Clear to partly cloudy skies overnight have supported modest radiative cooling, while dew points in the mid-teens and sustained winds of 10–30 km/h have limited further drops below seasonal norms of roughly 21.5 °C. Recent days’ minima hovering around 23–25 °C, combined with the absence of a stronger cold surge, have reinforced trader consensus on these two outcomes, though any late-night model revision or official final reading near a threshold could still shift probabilities before resolution.