It seems like those of us living along the coast have spent our entire summer in fog???
This isn't your imagination, and I've heard this question frequently. The zone of very hot, low pressure air called a 'thermal low' or 'heat low' has been largely confined east of the Cascades. With higher pressure off the coast, and the tendency of air to move from high to low pressure, that's led to a persistent onshore flow. That drives cooler ocean air onto the beaches....where it condenses overnight into low clouds or fog...if such low clouds haven't already developed before the ocean air moves ashore.