Long answer can be found in
https://www.amazon.com/Wind-Strategy-Sa ... 1909911542Short answer is that a sea breeze only extends a little bit from the shore with its maximum strength right at the shore. A sea breeze loses strength the further from the shore that you get. The topography of the shore line will effect this, as well as the temperature differential between the land and the water. A sea breeze is an attempt by nature to balance the air pressure difference between the hotter land and the cooler water so the bigger the difference in temperature the stronger the sea breeze will be and the further its effects will be felt.
Sea breezes are more likely in lighter prevailing breezes. Seasons and geography can be important to both whether a sea breeze will occur and its strength.
Jim Clark-Dawe