A sea breeze makes a coastal area cooler during the day as air moves inland from the sea.
Land heats faster than water under daytime sunlight. The air above the warmer land rises, lowering surface pressure relative to the cooler air over the water. Air then flows from sea toward land, producing a sea breeze. The circulation can also create a sea-breeze front where cooler marine air meets warmer inland air.
The reverse pattern, a land breeze, commonly develops at night because land loses heat faster than water. Sea-breeze strength depends on the land–sea temperature contrast, background wind, coastline shape, and local topography. Converging sea breezes can help trigger clouds or thunderstorms inland.