Apple Watches are water resistant rather than waterproof, meaning they can cope with many wet conditions but are not impervious to water damage. The distinction matters because resistance ratings are tested in laboratories and can decline over time through wear, damage, soap and steam exposure.

Apple Watch Series 2 and newer, including all SE models, are rated to 50 metres and are generally suitable for shallow swimming. Ultra models are rated to 100 metres and can be used for activities such as water skiing and scuba diving up to 130 feet; users should avoid unsuitable leather or steel bands and use Water Lock to prevent accidental screen input and expel water.