**Trader consensus has converged strongly on a 23°C high for Seoul/Incheon on October 9, 2026, with market-implied odds at 99.6%.** This positioning reflects consistent forecasts from meteorological models and observations showing a maximum around 23–24°C (74–75°F) under stable autumn conditions. Current data indicate partly cloudy to mostly cloudy skies, light westerly to northwesterly winds (typically 2–5 m/s), and surface temperatures peaking in the low-to-mid 20s°C during afternoon hours, with dew points near 14–16°C and negligible precipitation risk. Multiple sources, including detailed hourly tables and agency-aligned outlooks, project the daily maximum at or very near 23°C without significant deviations from the consensus model runs. The strong market-implied probability aligns with the narrow uncertainty range in short-term forecasts for this time of year, when typical October highs in the region hover around 20–22°C but can reach the mid-20s under clear or partly cloudy setups. Realistic challenges would require an unforecasted surge in solar heating, a shift in steering patterns, or measurement discrepancies at official stations, though late-day observations and model agreement make substantial revisions unlikely.