The sun heats the air and causes it to expand. It also causes water to evaporate. All this new H20 in the expanding air makes all these molecules that make up the air excited and fight for limited space available. This causes the wind.
As the sun goes down it is no longer heating the air. It cools off. A lot of the water in the air that is fighting for space condenses into liquid making more room for other air molecules.
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