Around here, that usually translates to an afternoon westerly breezy along the coast and through the Strait of Juan de Fuca, keeping summertime temperatures in the mid-upper 60s. In Seattle, it comes as a north breeze and tends to keep us in the low-mid 70s -- some of the best weather days Seattle sees during the year, if you're a sun fan.
SEATTLE - Seabreezes are most common along the coast and near Puget Sound during the summer months. They occur because the sun heats the land much quicker than it will heat the water. As the heat rises from the land, the air from the cooler Pacific Ocean will rush in to replace the rising air.