Hong Kong´s climate is sub-tropical, tending towards the temperate for nearly half the year. Temperatures can drop below 10 degrees Celsius in winter and exceed 31 degrees Celsius in summer. About 90 per cent of the rainfall occurs between April and September
Spring
(March - mid-May): Temperature and humidity rising. Jackets or sweaters suggested. Average temperature: 23°C (73°F), humidity around 82%, sea temperature, 22.3° C (72° F)
Summer
(late May - mid-September): Hot and humid. Temperature may rise to 33°C (91 °F) with humidity up to around 90%. . Shirtsleeves, cotton clothing, a sweater for indoors and an umbrella for outside suggested Average temperature: 28°C (82°F), humidity 80%, sea temperature 28°C (82°F).
Autumn
(late September - early December): temperature and humidity drop. Clear sunny days. Shirtsleeves to sweaters and light jackets suggested. Average temperature: 23°C (73°F), humidity 72%, sea temperature 17°C (63°F).
Winter
(late December- February): Cool with low humidity. Suits, light woollens and sometimes overcoats suggested. Average temperature: 17°C (62°F), humidity 72%, sea temperature 17°C (63°F).