Official forecasts from the Hong Kong Observatory point to a daytime maximum of 27 °C for May 17 under moderate southerly flow, with dew points in the low 20s °C and 75–95 % relative humidity. Variable cloud cover and the risk of scattered showers or isolated thunderstorms are expected to reduce insolation and cap heating, keeping readings clustered around 25–27 °C rather than the mid-May climatological average near 28 °C. Global ensemble guidance shows modest spread in cloud timing and convective initiation, which directly explains why market-implied odds remain tightly bunched between 25 °C and 27 °C. Updated model runs and the afternoon observation window will determine whether peak temperatures reach or fall short of the 27 °C threshold.