Overnight is fine. The sun is what kills pool floats.

Leaving your pool float in the water overnight is usually not a problem, but the real damage comes from UV rays and chlorine over time.

Most floats are made of vinyl or PVC and are literally designed to sit in water. One night floating around won’t ruin them. The bigger issue is leaving them out in the blazing sun for days on end. UV breaks down the plastic, makes it stiff, and eventually causes cracking. Chlorine and unbalanced pH can also eat at the