Mermaid Lagoon is the classic weather pivot. Much of the port sits under cover. Pair it with indoor attractions elsewhere (dark rides, enclosed shows) when outdoor queues feel miserable.
Bring a compact rain layer; resort ponchos appear when storms hit, but planning for wet walks between ports keeps morale up. Footwear that can handle puddles matters more than a perfect outfit.
Outdoor entertainment and some harbor views lose value in heavy rain. Swap those slots for Magellan’s or another indoor meal, shopping at Emporio, or a longer indoor attraction window.
Wait times can drop on outdoor thrill rides and spike on covered family attractions. Recheck the app and rebuild the afternoon list instead of forcing a sunny-day itinerary.