Subtropical Hong Kong has four distinguishable seasons - warm and humid spring, hot and rainy summer, pleasant and sunny autumn, cool and dry winter. Generally good weather makes it an ideal destination all year round.

Due to the tropical cyclones of various strengths and occasional squally thunderstorms from May to November and the typhoons in September, the ideal travel season is autumn, from October to around Christmas time. If happened to tour Hong Kong in the typhoon season, don't venture out too far when the typhoon signal is lower than 3; stay indoors when it gets higher. All shops and banks are closed when typhoon signal 8 is raised.

Introduction to Hong Kong Climate
Belonging to oceanic subtropical monsoon climate, Hong Kong has an annual average temperature of 23 C (73 F). From May to November, it may be attacked by tropical cyclones of various strengths and occasional squally thunderstorms. Typhoon season in Hong Kong is possible in September. 

Hong Kong weather in spring from March to mid-May tends to be warm and humid, accompanied by fog and drizzle. Sometimes air and ferry services are halted due to reduced visibility. The average temperature is 18 C (64 F) to 25 C (77 F) It turns to be a little bit cold at night, travelers should take a light overcoat, a sweater as well as rainwear.

Hong Kong’s summer from late May to the mid-September is extremely hot and humid, with frequent thunderstorms and occasional typhoons. Average temperature is 28 C (82 F). The hottest is in July and August when the mean temperature often exceeds 32 C (90 F) at daytime. However, the Discount Season is also attractive, in addition to the aquatic activities in Ocean Park and Disneyland. Bring an umbrella, shorts and dresses lightly in cotton. Pay attention to the weather forecast all the time.

Autumn in Hong Kong is cool, dry and with plenty of sunshine, from late September to the end of November. It’s rather comfortable to stroll along the wide and charming Victoria Bay or go on an excursion in Lamma Island or Lantau Island. At this time in Hong Kong, you may just wear short-sleeved shirts/T-shirts plus a thin overcoat to prevent the night coolness.

Dry and cool winter usually comes in December and ends at February, having an average temperature of 17 C (63 F). It’s an ideal time to do shopping in Hong Kong, since most stores, malls and markets will make sales promotions to sell out-of-season clothes. The temperature then is changeable – when a cold front comes, the cold and dry north wind brings the temperature drop down to less than 10 C (50 F) suddenly, and the temperature may fall below zero in northern New Territory and Tai Mo Shan area; when it turns out to be clear, the temperature will again rise up to 20 C (68 F) or above. You need a wool sweater and heavy coat now.

Hong Kong hotels are booked solid for April and October due to expositions and conventions. Horse races are usually held between September and the next June. Christmas sales attract many visitors; hotel prices skyrocket, especially at weekends. Make reservations at least one week in advance to avoid disappointment. Budget travelers should stay away.