Seoul's June precipitation market reflects uncertainty around the timing and intensity of the East Asian summer monsoon, or Changma, which typically intensifies in the latter half of the month and accounts for a large share of the seasonal total. Historical averages for Seoul hover near 130 mm, aligning with the leading 120-130 mm outcome at 36% implied probability. With roughly half the month elapsed under relatively drier early-June conditions, trader sentiment hinges on forecast model consensus for late-month rainfall accumulation, atmospheric moisture transport, and any potential delays or surges in monsoon onset. Official Korea Meteorological Administration updates and ensemble guidance on steering patterns and rainfall rates will likely drive further shifts in these closely matched bins.