Forecast models for mid-May in Hong Kong point to overnight lows near 24–26 °C as the dominant range, driven by the seasonal shift toward the southwest monsoon and elevated humidity that limits nighttime radiative cooling. Persistent cloud cover and light southeasterly winds further moderate temperature drops, keeping minimums above the long-term May average of roughly 24 °C recorded by the Hong Kong Observatory. With leading market outcomes tightly clustered, small differences hinge on exact cloud timing and any late-model adjustments to dew-point values. Traders monitor daily official forecasts through May 18 for signals on whether clearer skies could push the low toward 23 °C or sustained moisture caps it near 26 °C.