In March, the water temperature in Hawaii typically ranges from 73°F to 78°F (23°C to 26°C). A wetsuit is not always necessary, but many divers opt for a 3mm wetsuit or shorty for added warmth and protection from marine life and potential scrapes. If you're sensitive to cooler water or plan to dive for extended periods, wearing a wetsuit can enhance your comfort. Ultimately, it depends on your personal preference and tolerance to cooler temperatures.
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