Hong Kong's minimum temperature on July 12 is expected to fall in the upper-20s Celsius range under typical midsummer conditions of high humidity and scattered showers. Official guidance from the Hong Kong Observatory points to overnight lows near 29°C within a 29–33°C daily range, consistent with seasonal forecasts for normal to above-normal temperatures driven by background climate warming. High moisture content and potential cloud cover limit nocturnal radiative cooling, while urban heat effects further moderate drops. Trader probabilities cluster around 28–29°C because modest differences in wind, shower timing, or boundary-layer mixing can shift the observed minimum by 1–2°C; lower outcomes would require clearer, drier air or stronger advection, while warmer readings align with persistent cloud and humidity. Updated model runs and HKO briefings in the next 48 hours remain the key variables for market movement.