Ongoing heatwave conditions driven by the North Pacific High and easterly winds descending as dry, warm air—amplified by Typhoon Dolphin—have elevated overnight lows across the Seoul-Incheon region, keeping minimum temperatures near 27–28°C. High humidity restricts radiative cooling at night, while urban heat island effects and limited cloud cover sustain warmth; KMA forecasts and model consensus reflect these dynamics, with slight variations in wind or localized showers potentially tipping the daily low by 1°C. Traders weigh these factors amid typical August climatology of 22–24°C minima, producing closely matched implied probabilities as new short-range updates approach.