How come in the ocean their are warm spots?

Question

Like when you first walk into the ocean.. Is it pee?? I always get grossed out by this thought.

Answer 1

volcanic vents on the sea floor can warm the water up, as can the currents in the sea, the shallower the water is the warmer it will be and the temperature of the air above it also matters

Answer 2

When you first walk in you meet shallow water that

has been washing over sun -warmed sand.

As yo go further, you meet better mixed cooler water,

(and at a crowded beach, the occasional pocket of pee.)