A whole watermelon should be stored at room temperature until ripe, then refrigerated. Once cut, watermelon should always be refrigerated.
A whole watermelon actually benefits from being stored at room temperature until it's ripe. This allows it to continue developing its flavor and sweetness. Once ripe, or if you prefer a chilled watermelon, refrigerate it. However, once you cut into a watermelon, it's crucial to refrigerate it immediately. Cutting the watermelon exposes the flesh to bacteria and air, which can lead to spoilage. Store cut watermelon in an airtight container or tightly wrapped in plastic wrap to maintain its freshness and prevent it from absorbing odors from other foods in the refrigerator. Refrigerating cut watermelon helps to slow down the growth of bacteria and keeps it safe to eat for a longer period.
To prevent cut watermelon from becoming soggy, place a layer of paper towels at the bottom of the storage container to absorb excess moisture. This will help maintain its crisp texture.