What time does the sea breeze typically start to set in?

The onset of a sea breeze is primarily influenced by the temperature differential between land and water. As the sun rises, land heats up more quickly than the water, creating a difference in air pressure. This temperature difference results in the air over the land becoming warmer and rising, while the cooler air from over the water moves in to replace it, establishing a sea breeze.

Typically, this process begins to become noticeable a few hours after sunrise, when the land has had enough time to warm up significantly. Around 10 am is generally the time when the temperature differences become pronounced enough to initiate the sea breeze. As a result, the cooling influence of the sea breeze starts to set in during the late morning to early afternoon hours.

While a sea breeze can indeed develop later in the day or in response to other factors, the most consistent onset occurs around 10 am when the warming of the land is sufficient to drive the process.