Located in the subtropical climate zone, Macao has moderate climate conditions throughout the year. Annual average temperature is about 23ºC (73ºF) and ranges from 20ºC (68ºF) to 26ºC (79ºF). Humidity levels are high in the city, where the average annual relative humidity tops 79%. The average annual rainfall measures about 2,058 mm in Macao, with the rainy season falling between May and September every year. The Macao Meteorological and Geophysical Bureau will issue a rainstorm warning when the amount of precipitation over Macao is expected to reach about 50 mm in the next two hours.
October to December is the most pleasant season to visit Macao, when visitors can enjoy warm autumn days with low humidity. January, February and March are the winter months with relatively cold but sunny weather, when it slowly gets warm again in April. From May to September, the weather becomes hot and humid with more rainy days and occasional tropical storms (known as typhoons). The level of typhoon warning signals depends on the intensity and proximity of a typhoon to Macao. When signal No. 8 or above is hoisted, the cross-sea bridges will be closed for safety reasons including Governador Nobre de Carvalho Bridge, Friendship Bridge, the upper deck of Sai Van Bridge and Lotus Bridge; as an immediate measure, the enclosed lower deck of Sai Van Bridge will be opened provisionally for light automobiles to commute between Macao and Taipa. Outbound ferries and flights from the city will also be delayed or cancelled.
In summer, visitors are advised to wear light cotton clothes for a pleasant journey in Macao; while woolens are recommended along with a thick jacket or an overcoat to keep warm during winter. It is great to bring along cardigans or sweaters in spring (March to May) or autumn (September to November) as nights are cooler during the two seasons.
For more infomation please visit website of the Macao Meteorological and Geophysical Bureau