If it is a seabreeze (being from WA, we get our fair share), it is caused by localised heating of the land. As the air gets hotter it becomes less dense and therefore rises.
Something must fill in the gap after the air has risen. In comes the cooler, denser, ocean air in the form of the seabreeze.

For us in Perth and the rest of WA (not going too far north), it's only good to be hot to a certain point. Once it is high 30's it is usually troughed out and there will be no seabreeze. No idea what happens on the eastern coast.

No idea about the dew?

Cool as. Thanks for that. I now understand why :)

You need a 3 deg difference between land temp and water temp for a seabrease !.

A heavy morning due is due to a lack clouds. less clouds = hotter land temp = higher differential land/water temp = stronger seabrease.

Well that is my uneducated guess anyway.

I live in yeppoon central qld. And our Seabreeze is a cracker, super clean and consistent. But if you look at the forecast they never predict it. If it's in the red arrows NE your guaranteed 17-20knots, if the arrows are in the yellow NE you know it's going to be nuking. But SE on the other hand is the opposite, they recon 20knots you will be lucky to get 15 knots MAYBE.

Plummet said..
You need a 3 deg difference between land temp and water temp for a seabrease !.

A heavy morning due is due to a lack clouds. less clouds = hotter land temp = higher differential land/water temp = stronger seabrease.

Well that is my uneducated guess anyway.

Morning dew doesn't just form with a lack of clouds... Dew is a type of condensation. It happens when the surface temp of an object like grass, is colder than the dew point (the temp of the air at saturation point) of the air.

I'm pretty sure the seabreeze works when the air gets hot over the land, and the cool high pressure air on the ocean rushes to the low pressure air on the land.

It works better with heat to a stage, but then there gets a stage where its too hot (how it happens in Melbourne anyway) and there is a Northerly blowing, or any inland wind blowing, it kills the seabreeze effect. Sometimes if the northerly drops off we will then get a bit of a breeze come in. But I don't think it takes much of an opposing wind to stop the seabreeze effect.