Trader sentiment for Seoul's June precipitation centers on the East Asian summer monsoon, or Jangma, whose onset and intensity in the latter half of the month will determine totals. Historical averages hover near 130 mm, aligning with the leading 120-130 mm bin at 36.5% implied probability, while closely matched surrounding outcomes reflect model uncertainty in rainfall timing and amount. Early June has featured typical pre-monsoon showers, but warmer sea-surface temperatures and shifting pressure patterns may accelerate the rainy season around June 20, potentially boosting late-month accumulation without exceeding climatological norms. Key variables include steering patterns and any short-term forecast revisions from the Korea Meteorological Administration.