It looks like December average water temperature is 75-78° with average highs/lows being 79/63.
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The best time of year to visit is from December to May. Temperatures at this time are between 21 to 24 25°C (70-75 F), and the risk of tropical storms is low. Swimming year round is also possible however, because seawater temperatures usually stay above 25°C (80 F).
Winter is the best time to go to The Bahamas. In December, January, and February, average temperatures in Nassau hover around 73? (22.7?) with highs reaching a comfortable 81? (27.2?). Winter is the dry season, with rainfall of two inches (50mm) per month. Take advantage of the balmy weather to explore.
Most days are warm enough to swim and snorkel. The first week in December is usually the nicest weather of the year -- not too hot and mostly sunny skies. Once in a while, a cold front reaches us that early, but not too often.
The waters off the Bahamas are safe and ideal for swimming.This archipelago of nearly 700 islands is located in the Atlantic Ocean, more towards the southeast direction of America (near Florida).
“The Bahamas boasts tropical warm temperatures 365 days a year. Casual summer wear is perfect for your days in the sun but be sure to pack a light jacket or sweater for the cooler evenings from December to February which can dip to 72 degrees,” Duncombe advises.
Visitors love taking a luxurious trip to these Caribbean islands around Christmas. The Bahamas weather in December is cooler and more comfortable than in summer, but there's much less rain and hours of sunshine as you sunbathe by the beaches and your pool.
From December through February, temperatures range from high 70s during the day to lows in the mid 60s at night. March starts a slight warm up, and the months of April to November bring high temperatures in the mid to upper 80s with nighttime temperatures in the low to mid 70s. You have options for your Bahamas cruise.
Nassau is around the same temperature as Miami in the summer. The daily temperature in Nassau averages around 28°C (82°F) in July, and Miami fluctuates around 83°F (28°C). People are often attracted to the plentiful sunshine in Miami this time of the year.
The wet season runs from June to November; the two wettest months are October and June. Although some days are wet and grey in the rainy season, showers usually pass quickly. The island has over 300 days of sunshine each year.
The Bahamas are affected significantly by strong coldfronts that move through the US and this yaar there have been very strong cold fronts. With that said, Mid-December to Mid March can be very windy in the central to northern bahamas because of the pressure gradient.
Bermuda and the Bahamas Are a Bit Less Sheltered Than the Caribbean. Rough Waters: While cruises to Bermuda and the Bahamas from the East Coast are usually smooth, squalls can arise on the Atlantic Ocean, particularly during hurricane season. The bigger your ship, the less you'll feel the waves.