Why do sea breezes occur during the day?

Sea breezes occur during hot summer days because of the unequal heating rates of land and water.

Sea breezes occur during hot, summer days because of the unequal heating rates of land and water. During the day, the land surface heats up faster than the water surface. Therefore, the air above the land is warmer than the air above the ocean. Now, recall that warmer air is lighter than cooler air