Korea's Jangma Season
Average start and end of Jangma across Seoul, Busan, and Jeju (KMA 1991–2020 norms).
| Region | Start | End | Days | Rainfall |
|---|---|---|---|---|
| Seoul | 6/25 | 7/26 | 32 | 378 mm |
| Busan | 6/23 | 7/24 | 32 | 348 mm |
| Jeju | 6/19 | 7/20 | 32 | 398 mm |
Seoul — Central Korea monsoon; heaviest downpours in early-mid July.
Busan — Southern monsoon starts a few days earlier; typhoons add rainfall.
Jeju — Monsoon arrives earliest and rainfall totals are the highest.