Maysak rapidly intensified into a strong typhoon before weakening and making landfall in South Korea.

[3] Maysak's precursor disturbance was an area of low pressure over the western Pacific east of the Philippines.

[4] At 06:00 UTC on August 27, the Japan Meteorological Agency determined that a nearly stationary tropical depression had formed near 15°N, 132°E.

[6] The newly formed system was located in an environment conducive to storm development, including warm sea surface temperatures and low vertical wind shear.

[7] Clusters of atmospheric convection emerged around the storm's center, comprising formative rainbands wrapping into the developing circulation.

[8][9] Early on August 28, the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) assessed the system as a tropical depression with the local name Julian.

[18] An approaching trough over eastern China and western Japan caused Maysak to accelerate towards the north as it continued to traverse energetic ocean waters.

[22][23] Maysak held this intensity as it began to move into a less conducive environment for storm development within the East China Sea.

[24] Soon, Maysak began to weaken steadily as it passed the East China Sea, slowing back down to a Category 3 storm.

[33] Kadena Air Force Base was placed on Tropical Cyclone Conditions of Readiness level 1 (TCCOR 1), denoting the onset of destructive winds.

[38] On 2 September 2020, Panamanian-flagged cargo ship Gulf Livestock 1 with 43 crew members, including 39 seamen from the Philippines, two from New Zealand and two from Australia, and thousands of cattle onboard was reported missing in the East China Sea.

Maysak resulted in two deaths,[41] caused over 120,000 power outages, and damaged over 5,100 hectares of farmland as well as a further 800 structures.

[27] Maysak brought heavy rainfall to eastern North Korea peaking at 15.157 inches (385.0 mm) in Wonsan.