The tropical cyclone reached its peak intensity on September 10 with winds estimated at 155 km/h (100 mph) and a minimum barometric pressure of 945 mbar (hPa; 27.91 inHg).

[2] Tracking towards the northwest, the system intensified to tropical storm status east of the Philippines at 0000 UTC on September 7.

[2] With its trajectory determined primarily by a nearby ridge,[2] Khanun gradually intensified, reaching typhoon intensity at 1800 UTC on September 8, southeast of Okinawa.

[3] A slight northerly curve brought Khanun to a landfall in Zhejiang Province at 0600 UTC the next day At the time of landfall, the storm harbored sustained winds of 140 km/h (85 mph) Afterwards, Khanun quickly weakened, and was already downgraded to tropical storm status by the day's end.

After making a curve northeastwards into the Yellow Sea, the JMA determined that the diffuse storm had fully transitioned into an extratropical cyclone on September 13, and shortly thereafter the JMA no longer monitored the system as a cohesive cyclone..[3] The resultant vortex tracked rapidly across the Sea of Japan before reentering the northwestern Pacific Ocean; it was last noted over open waters on September 16.

Eleven homes were inundated by these floodwaters, and an additional 1,000 residences were impacted by power outages resulting from wind damage.