The close market split between 30°C (43.5%) and 29°C (37.5%) stems from uncertainty in daytime heating under the strengthening northeast monsoon, which the Hong Kong Observatory forecasts will deliver mostly sunny, dry conditions and a 23–30°C range for October 7. Moderate northeasterly winds and low humidity (45–75%) should limit convective warming and evaporation, keeping maxima near the lower end of guidance, while reduced cloud cover and solar insolation could allow brief peaks near 30°C. Recent model runs show minimal spread around this threshold, consistent with early-October climatology, with resolution hinging on official Observatory observations the following day.