Arnos Vale Beach is generally safe for swimming, particularly in its calmer sections. However, it's most renowned for its snorkeling, so swimmers should be aware of snorkelers and any boats. The water is typically clear and calm, especially on good weather days, making it excellent for observing marine life. Always exercise caution and be mindful of your surroundings, especially near the reef areas.

The best time to visit Arnos Vale Beach for snorkeling and ideal weather conditions is typically during Tobago's dry season, from December to May. During these months, the seas are generally calmer, and visibility for snorkeling is at its peak. Visiting during 'less crowds' periods, often outside major holidays, can enhance the tranquil experience, allowing for more undisturbed exploration of the nearshore reef.