Persistent showers and cloud cover associated with a broad trough over the South China Sea are the dominant near-term drivers, limiting nocturnal radiative cooling and holding minimum temperatures near or slightly below the early-August climatological average of 26–27°C. High humidity and light southeasterly winds further reduce overnight drops, while official guidance points to lows around 25–26°C for August 3. The Hong Kong Observatory’s seasonal outlook for normal-to-above-normal temperatures provides longer-term context, yet short-range model consensus and recent daily forecasts emphasize precipitation-driven suppression through the first week of the month. Traders therefore assign the highest implied probabilities to 25°C and 24°C, reflecting the balance between typical monsoon conditions and the current synoptic pattern expected to persist into the resolution window.