Question

Why the temperature of the water is less than the temperature of its surroundings?

Answer 1

It really depends on what surface on what are you on too example:mountains,backyard,ocean

Answer 2

At the surface of the water, the more energetic molecules are escaping (evaporating). If the relative humidity is less than 100%, more are evaporating than are recondensing from the atmosphere. But that is taking heat energy from the water, so the temperature drops