Though the Japan Meteorological Agency (JMA) determined Rumbia to have dissipated on December 2, the Joint Typhoon Warning Center (JTWC) continued to monitor the system over the next few days as it tracked across the South China Sea.

For a period of time beginning on December 5, Rumbia reorganized and strengthened back to tropical storm intensity before wind shear began to weaken the system.

Embedded within the monsoon trough and tracking westward, the system organized, and as a result the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) designated the storm as Tropical Depression Toyang at 0000 UTC on November 25.

[1] Upon attaining tropical storm status, Rumbia was determined to have officially reached its peak intensity, with maximum sustained winds of 75 km/h (45 mph) and a minimum barometric pressure of 990 mbar (hPa; 29.23 inHg).

[1] At 0600 UTC on December 2, the JMA declared Rumbia to have dissipated,[2] while the Joint Typhoon Warning Center (JTWC) continued to monitor the system as an active tropical cyclone.

Over the next few days, as the cyclone continued to track in a general westward direction, persistent inhibiting factors including the entrainment of cold air and wind shear prevented Rumbia from redeveloping.

[2] This period of strengthening was only temporary, as shearing conditions once again arose, weakening the system and thus resulting in its subsequent downgrade to tropical depression status late the following day.

By December 7, Rumbia's main circulation center had become devoid of convection,[1] and the JTWC issued their final warning on the system while the depression was located south of Vietnam.