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Where in the Bahamas?
Unless you are a polar bear, I don't think that will be enough exposure protection. Remember that the Bahamas is in the sub-tropical Atlantic, not the Caribbean. We're warmer than a lot of the Atlantic but it is still the Atlantic.
Better to err on the side of caution and bring/rent more rubber. Cold divers are not happy divers!
I will be in Nassau for a couple of days at the end of January and am a real wuss when it comes to the cold. In 78 degrees I need a 5mil and in 80 degrees a 3mil. Read reports of the temps going as low as 68 during the winter. I am planning on bring a 6mm but am wondering now if I should bring my dry suit - Is a dry suit total overkill????
Thanks
Craig