The best bet is to dry out the boat by opening up all the enclosed areas and allowing them to dry prior to storage. Then use a cover that allows moisture to pass through the material but keeps dew and moisture out. If your boat is on a trailer or lift, remove the plug to allow the bilge to drain so that there is less moisture available to condense in cool enclosed areas of the boat. Be sure to place the removed plug in plain sight to remind you to replace it when launching.
