• The phenomenon of urban heat islands in Korea has a characteristic that occurs even on days with low solar radiation quantity, unlike other cities in the world.

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• In recent years, due to climate change, the rainy season is gradually shortening, and heavy rains are occurring more frequently. This has increased the number of hot, humid and low solar radiation quantity days, deepening the situation.

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• A study found that the altitude, wind speed, and green area were the main factors in the urban heat island phenomenon on a clear day. On cloudy days with low solar radiation quantity, the aspect ratio of buildings was a major factor in the urban heat island phenomenon.

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• Therefore, we will numerically model the urban heat island phenomenon with both *solar radiation quantity and water vapor in the atmosphere as manipulated variables. Through this, we intend to develop a numerical model that can well characterize the urban heat island phenomenon in Korea.