Hong Kong Observatory's latest forecast models point to a high of around 27°C on March 23, fueling the 29% implied probability for that outcome and keeping it neck-and-neck with 28°C or higher at 25% and 26°C at 24%. Persistent southerly winds are advecting warm, moist air from the South China Sea, elevating daytime maxima above the late-March climatological average of 23°C, but traders weigh uncertainty from potential afternoon showers or increased cloud cover that could cap peaks at 26°C. Ensemble predictions show low spread, with recent observations of 25-26°C highs underscoring how minor shifts in humidity or sea breeze timing differentiate these closely matched outcomes.