Current forecasts from the Hong Kong Observatory and regional models indicate typical early-summer conditions for May 21, with nighttime lows most likely settling between 24°C and 27°C under partly cloudy skies and light southerly winds. The tight clustering of market-implied probabilities around these values reflects ongoing uncertainty in exact minimum readings, driven by potential localized showers that could enhance radiative cooling or brief wind shifts that limit overnight heat retention. Sea surface temperatures near 26°C continue to anchor warmth across the Pearl River Delta, while the absence of any strong frontal systems or tropical disturbances keeps extreme deviations unlikely. Updated guidance on cloud cover and precipitation timing through the weekend will be the key variable narrowing the range before resolution.