It traveled steadily west-northwestwards and made landfall in Central Luzon late on October 1, before crossing into the South China Sea the next morning.

The adverse weather forced ports and schools to close, while numerous landslides and flash floods damaged roads, houses, and agricultural land.

Large waves caused by the storm capsized several fishing boats, necessitating search-and-rescue operations by the Philippine Navy and Coast Guard.

In preparation for the storm, ships and offshore workers were recalled to port, flights were delayed or canceled, train services were suspended, and tourist attractions were shut.

Hong Kong and Macau experienced gusty winds and heavy rain from October 3 to 5 as Mujigae passed to the south, but were left relatively unscathed.

Towards the end of Mujigae's lifespan, its outer rainbands brought heavy rains to parts of Vietnam, Cambodia, Laos, and Thailand, causing localized flash floods.

[4] Amid low vertical wind shear and good outflow helping the growth of thunderstorms, the depression improved further in organization through October 1, as it moved west-northwestwards under the influence of a subtropical ridge to its north.

[6] The JMA upgraded the system to a tropical storm at 12:00 UTC as it began producing 10-minute sustained winds of 65 km/h (40 mph),[nb 5] giving it the name Mujigae.

[11] Once over water, Mujigae soon resumed intensifying, taking advantage of 28–29 °C (82–84 °F) sea surface temperatures and strong outflow despite slightly elevated wind shear.

[2] A nascent eye feature became visible on microwave satellite imagery, while associated thunderstorms grew more intense and wrapped more tightly into the system's circulation.

[14] A 30-hour period of rapid intensification began at 00:00 UTC on October 3, aided greatly by the anomalously warm waters of the South China Sea, which even exceeded 30 °C (86 °F) around Hainan.

Monthly mean sea surface temperatures in the area were the warmest since 1990, giving Mujigae ample energy to draw upon for strengthening in spite of moderate easterly wind shear.

The JTWC assessed that Mujigae continued to strengthen for a further three hours and attained peak 1-minute sustained winds of 215 km/h (134 mph),[2] the equivalent of a Category 4 hurricane on the Saffir–Simpson scale.

The JTWC continued tracking Mujigae while it moved inland over Guangxi province and last noted it as a dissipating tropical storm at 06:00 UTC on October 5.

[2] Mujigae (known locally as Tropical Storm Kabayan) passed over Luzon from October 1 to 3, bringing moderate rain and winds gusting up to 120 km/h (75 mph).

Following the storm, local government units and the Department of Social Welfare and Development gave ₱2.37 million (US$52,100) worth of disaster relief to Aurora, Bulacan, and Nueva Ecija provinces.

[23] The Philippine Navy activated two Islander aircraft and several ships to conduct search and rescue operations,[21] in conjunction with vessels from the Coast Guard.

[21] Typhoon Mujigae brought severe impacts to the provinces of Guangdong, Guangxi, and Hainan from October 3 to 6, affecting over 7.5 million people and killing 27.

Mujigae came ashore during a week-long holiday (known as a "Golden Week") following China's National Day, disrupting the plans of many tourists seeking to travel to the southern coast.

[37][38] Mujigae's track and rapid intensification prior to landfall drew comparisons to Typhoon Rammasun, which had significantly impacted similar areas a year earlier.

[39] Ahead of the storm, the China Meteorological Administration issued red alerts for the province, expecting wind gusts exceeding 200 km/h (120 mph) and rainfall accumulations of 250–280 mm (9.8–11.0 in).

[40] The Qiongzhou Strait was closed to marine traffic on the evening of October 2, and nearly 40,000 fishing boats west of Shanwei returned to port to shelter in Guangdong.

[50] The Foshan tornado was rated EF3 on the Enhanced Fujita scale, based on observations of collapsed tower cranes and destroyed factories and warehouses.

Hence, when Mujigae struck China in 2015, the country had no tornado forecasting or warning systems, likely contributing to an elevated number of fatalities and more extensive damage.

[46] As Mujigae was expected to pass over eastern Guangxi, warnings for heavy rain and gusty winds were issued, and an increased possibility of landslides was noted.

[77] A runner participating in a race between Lantau and Sunset Peaks suffered a broken arm when he slipped off the track amid the adverse weather conditions.

[85] The combination of Mujigae and a cold front brought up to 100 mm (3.9 in) of rain to mountainous regions in the Vietnamese provinces of Quảng Ninh, Lạng Sơn, and Cao Bằng.

[86] Meanwhile, heavy rains in Northeast and Central Thailand had the beneficial effect of filling reservoirs, but caused several flash floods on October 4 and 5.

[54] The next day, Guangdong authorities moved 300 tents, 300 folding beds, 2,100 quilts, 4,100 towels, 3,500 sets of clothing, and 250 emergency lights to affected cities.

[95] At the 48th Session of the ESCAP/WMO Typhoon Committee held from February 22 to 25, 2016, the name Mujigae was retired following a request by China due to the high damage and death toll caused by the storm.