Yes, you can. You can swim in the sea year round in Jamaica. The sea is warmest during July through October. Average sea water temperature in Discovery Bay in February is about 81°F/27°C.
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Curacao, Bonaire and Aruba are the warmest islands during that period of time... Also take a look at Barbados and St. Lucia. For warm air and water, the further south in the Caribbean, the warmer.
The best time to visit Jamaica is during the dry season, from mid-December through April. The sunny days and pleasant temperatures create optimum conditions for enjoying the beaches, rainforest, markets, and towns. Summer, especially July, when rainfall dips, is also a good time to visit.
Aside from these three areas, there are five lesser known areas that could potentially hold exciting adventures for your Jamaican vacation, but first let's talk about the reasons Montego Bay, Negril, and Ocho Rios have remained at the top of the best areas to stay in Jamaica for so many years!