San Diego weather is often the weather that laughs at you. For some reason, the forecast will say clear skies and clouds will roll in off the ocean, or the forecast will tell you to wear a jacket for an overcast day and the sun will come out to play.
Key Difference: Oceans are large bodies of water that exist on the Earth. Oceans and seas are both bodies of water and these terms are often used interchangeably due to their lack of proper definition. Water bodies make up the hydrosphere that covers 71% of the Earth. Oceans and seas have slight differences among them.
As the term has been applied over time, there are no sharp distinctions between seas and oceans, although seas are smaller and are usually bounded by land masses (and ones smaller scale than continents), the singular standard exception being the Sargasso Sea, which is created by the four currents bounding what is termed the North Atlantic Gyre.