The season's peak months August and September saw minimal activity caused by an unusually strong and a persistent suppressing phase of the Madden–Julian oscillation (MJO).

[1] These agencies include the Tropical Storm Risk (TSR) Consortium of the University College London, Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) and the Taiwan's Central Weather Bureau.

[1][2][3] During October 2013, the Vietnamese National Center for Hydro Meteorological Forecasts (VNCHMF) predicted that one to two tropical cyclones would develop and possibly affect Vietnam between November 2013 and April 2014.

Jangmi affected the southern Philippines and dissipated during January 1, 2015, making it the first storm in the Western Pacific to span two calendar years since Typhoon Soulik in 2000.

[16] Despite not making landfall as a tropical cyclone on the Philippines, the system brought considerable rainfall over several days to southern Mindanao that caused six flooding and sixteen landslide incidents.

[19][23] The system subsequently continued to move westwards under the influence of the subtropical ridge of high pressure, before it reached its peak intensity as a tropical storm with wind speeds of 65 kilometres per hour (40 mph) during January 31.

[25][26] Kajiki impacted the Philippines between January 30 and February 1, where a total of 13 landslides and 4 flooding incidents, were recorded in the provinces of Cebu and Southern Leyte.

[41] Late on April 13, the remnants of Peipah regenerated into a tropical depression to the east of the Philippines, while slowly continuing to approach the island nation.

[56] Mitag peaked with 10-minute sustained winds of 75 kilometres per hour (47 mph) later that day until it was last noted by the JMA early on June 12, as the system was absorbed by a developing extratropical cyclone located north of Japan.

[54] There was no damage reported in association with Tropical Storm Mitag (Ester) in the Philippines, however, it did prompt PAGASA to declare the official start of the rainy season on June 10, 2014.

[75] Subsequent convective deepening and enhancement of banding features resulted in the system's classification as a tropical storm on July 12 with the JMA assigning the name of Rammasun.

[citation needed] Owing to its proximity to the Philippines, PAGASA began monitoring the storm on July 13 and assigned it the local name Glenda.

[74] Rapid intensification ensued on the next day as Rammasun struck the Bicol Region of the Philippines as a Category 4 typhoon with 1-minute winds of 215 kilometres per hour (134 mph).

After briefly weakening to a severe tropical storm, favorable environmental conditions allowed for reorganization and Rammasun reached its peak intensity on July 18 as it approached southern China with a minimum pressure of 935 hPa.

[74] Featuring a well-defined eye surrounded by deep convection and prominent outflow, the JMA estimated the typhoon's winds at 165 kilometres per hour (103 mph).

[86] Halong maintained that intensity until made landfall over to the east of Tokyo, Japan on August 9, where the typhoon weakened to a severe tropical storm.

[99] Later that day, Genevieve rapidly weakened to a strong Category 2 typhoon, as it began to encounter increasing windshear and drier inflow, to the south of the system.

By September 9, Fengshen briefly reached its peak intensity as a severe tropical storm, with the JTWC considering it as a typhoon, with 1-minute sustained winds of 120 kilometres per hour (75 mph) as it made a ragged eye.

[107][108] Late on September 5, the JMA reported that a tropical depression had developed out of an area of low pressure that had crossed central Luzon and was now located about 430 km (265 mi) to the south-west of Manila.

[112] On September 15, Kalmaegi entered the South China Sea and intensified to a typhoon again, where it reached its peak intensity with sustained winds of 140 kilometres per hour (87 mph) while making its second landfall over Hainan Island.

Quezon City had a precipitation total of 268 mm in less than six hours and the Marikina River reached the level of 20 meters, causing many people to evacuate within the area.

[135] On September 26, the JMA upgraded the system to a severe tropical storm and reached peak intensity with sustained winds of 95 kilometres per hour (59 mph).

[145] Phanfone affected the Formula One 2014 Japanese Grand Prix, bringing strong winds and heavy rainfall which made the track surface wet and significantly reduced visibility.

[151] Vongfong made landfall over southwestern Japan on October 13, just as both agencies downgraded it to a strong tropical storm, though the JTWC issued its final warning a few hours later.

[161] Late on November 2, Nuri had attained its peak intensity, with maximum sustained winds of 285 kilometres per hour (177 mph), tied with Vongfong, though its minimum pressure was recorded at 910 hPa.

Early on December 4, Hagupit reached its peak intensity with 10-minute sustained winds of 215 kilometres per hour (134 mph) and a minimum barometric pressure of 905 hPa.

[172] The next day, both agencies downgraded Hagupit to a severe tropical storm, due to its continued slow movement and land reaction as it made its third landfall over the island of Marinduque.

[170] Although due to an increase of deep convection near the center, Hagupit slightly strengthened, though its intensity remained at tropical storm strength.

[175][176] By December 29, Jangmi made landfall over the town of Hinatuan in the province of Surigao del Sur and briefly reached its peak strength packing maximum winds of 85 kilometres per hour (53 mph).

The depression affected Hainan Island, Southern China and northern Vietnam by heavy rainfall and flash floods as it was moving in a westward direction.