Beihai is a prefecture-level city in the south of Guangxi, People's Republic of China. Its status as a seaport on the north shore of the Gulf of Tonkin has granted it historical importance as a port of international trade for Guangxi, Hunan, Hubei, Sichuan, Guizhou, and Yunnan. Between the years 2006 and 2020, Beihai is predicted to be the world's fastest growing city.
Beihai has a large shipyard, but most of the money generated in the city is derived from trade.
In addition, it governs the small islands of Weizhou and Xieyang, and is directly west of Leizhou Peninsula.
After the 1876 Sino-British Treaty of Yantai, eight Western nations (the UK, US, Germany, Austria-Hungary, France, Italy, Portugal, and Belgium) set up consulates, hospitals, churches, schools, and maritime customs. Today, 15 of these western buildings remain in Beihai. It officially became an international tourist spot in 1982.
Beihai has a monsoon-influenced humid subtropical climate (Köppen Cwa), with mild to warm winters and long, hot (but not especially) summers, and very humid conditions year-round. The monthly 24-hour average temperature ranges from 14.6 °C (58.3 °F) in January to 29.0 °C (84.2 °F) in July, while extremes have ranged from 2.6 to 37.1 °C (37 to 99 °F). Rain is both the heaviest and most frequent from June to September, when 70% of the annual rainfall also occurs. This is in contrast to the autumn and winter months, where only 20 to 40 millimetres (0.79 to 1.57 in) of rain falls per month. The area receives about 2,000 hours of sunshine annually.