Recent forecasts from the Korea Meteorological Administration highlight moderate radiative cooling under mostly clear overnight conditions as the key driver keeping Seoul's expected minimum temperature clustered around 15–17°C for May 19. Springtime high-pressure dominance favors light winds and efficient surface heat loss after daytime maxima near 23°C, while subtle northeasterly flow may introduce slightly cooler marine air. Ensemble model runs show tight agreement on these values, with limited upside risk from increased cloud cover or stronger advection that could push readings lower. Historical May climatology places average overnight lows near 13°C, underscoring how this event sits slightly above baseline yet remains sensitive to final 48-hour adjustments in boundary-layer moisture and wind shear. Traders weigh these variables closely ahead of the official KMA verification.