Whether you need a wetsuit for snorkeling depends primarily on water temperature and duration, rather than your ability to swim. In tropical destinations like the Maldives or the Caribbean, where water is 80°F (27°C) or warmer, a simple rash guard is often sufficient to protect against sunburn and jellyfish stings. However, in cooler waters (below 75°F/24°C) or if you plan to snorkel for more than 45 minutes, your body will lose heat faster than it can produce it, making a thin (2mm or 3mm) "shorty" wetsuit essential for comfort and safety. Beyond warmth, a wetsuit provides natural buoyancy, which can be a huge confidence booster for less experienced swimmers by helping you float effortlessly on the surface. In 2026, many eco-conscious snorkelers also use wetsuits as a "chemical-free" alternative to sunscreen, as even "reef-safe" creams can be harmful to coral. If you are snorkeling in temperate areas like the Mediterranean or California, a full-length 5mm suit is highly recommended to prevent hypothermia and allow for an enjoyable underwater experience.