**Trader sentiment for Seoul's August 2026 precipitation reflects high uncertainty around remaining monthly totals after limited early-August rainfall.** With the month only one-third complete, short-term Korea Meteorological Administration forecasts indicate low precipitation probabilities (mostly 0–20%) over the next several days, keeping current accumulation well below historical August averages of 250–350 mm. The closely matched market-implied odds across bins from 250 mm upward highlight the dominant influence of potential late-month typhoon activity in the western North Pacific, whose tracks, intensity, and landfall timing remain highly variable in ensemble models. Warmer sea-surface temperatures and steering patterns tied to the East Asian summer monsoon could favor heavier events capable of pushing totals into the 350–400 mm or 500+ mm ranges, while persistent high-pressure dominance would favor lower outcomes near or below 300 mm.