Remove your Shrink Wrap as soon as the weather permits. Shrink wrap done correctly should have vents installed. If there are no vents and the temps heat up cut strategic holes in the wrap. If the boat is left covered on hot days the inside will become an incubator without ventilation.
It’ll be a perfect environment for mold to develop. “Food for thought” Traveling at highway speeds with shrink wrap on your boat may cause gelcoat rash (chafing)