**Trader sentiment for Hong Kong’s June 16 daily minimum temperature centers on 25–28 °C, with 26 °C holding the clearest edge at 34.5 % implied probability.** Short-range forecasts from the Hong Kong Observatory and consensus models show persistent cloud cover and showers driven by an active southwest monsoon and a low-pressure trough, which limit nighttime radiative cooling and keep minima in the mid-20s °C range. Climatologically, June overnight lows average near 26–27 °C; the current seasonal outlook for above-normal temperatures supports the 27–28 °C outcomes that together command 37 % of the market. Heavier rain episodes can suppress the minimum toward 25 °C or briefly 24 °C by enhancing evaporative cooling and reducing surface heat loss, while clearer breaks would allow readings to reach 28 °C. Model spread in precipitation timing and cloud thickness over the next 48 hours explains the relatively flat distribution across the central bins and the sharp drop-off outside 24–28 °C. Official HKO updates and the next model runs will be the primary catalysts for any shift in these probabilities.