The 2006 Pacific typhoon season was a near-average season which produced a total of 23 named storms, 15 typhoons, and six super typhoons. The season ran throughout 2006, though most tropical cyclones typically develop between May and October. The season's first named storm, Chanchu, developed on May 9, while the season's last named storm, Trami, dissipated on December 20.

Typhoon Chanchu, known in the Philippines as Typhoon Caloy, was the most intense typhoon in the South China Sea in the month of May according to the Hong Kong Observatory (HKO). The first named storm of the 2006 Pacific typhoon season, Chanchu formed on May 8 in the vicinity of the Federated States of Micronesia and progressed westward. It gradually intensified into a tropical storm and later severe tropical storm before moving through the Philippines. On May 13, Chanchu entered the South China Sea and became a typhoon, according to the Japan Meteorological Agency (JMA). Warm waters and favorable outflow allowed the storm to quickly intensify to peak maximum sustained winds of 175 km/h (109 mph) on May 15. Around that time, the typhoon turned sharply to the north toward southeastern China. Chanchu weakened as it curved to the northeast, making landfall near Shantou, Guangdong on May 17 as a severe tropical storm. The government of China considered Chanchu the earliest typhoon to make landfall in the province. On the next day, the storm emerged into the East China Sea, becoming extratropical on May 19 before dissipating west of Kyushu.