Sunshine is practically an everyday affair in the Virgin Islands. Temperatures climb into the 80s (high 20s Celsius) during the day, and drop into the more comfortable 70s (low 20s Celsius) at night. Winter is generally the dry season in the islands, but rainfall can occur at any time of the year. You don't have to worry too much, though -- tropical showers usually come and go so quickly you won't even really notice. If you're out exploring for the day, you may want to bring rain gear.
Hurricanes -- The hurricane season, the dark side of the Caribbean's beautiful weather, officially lasts from June to November. The Virgin Islands chain lies in the main pathway of many a hurricane raging through the Caribbean, and the islands are often hit. If you're planning a vacation in hurricane season, stay abreast of weather conditions. It may pay to get trip-cancellation insurance because of the possibility of hurricanes.
Islanders certainly don't stand around waiting for a hurricane to strike. Satellite forecasts generally give adequate warning to both residents and visitors. And of course, there's always prayer: Islanders have a legal holiday in the third week of July called Supplication Day, when they ask to be spared from devastating storms. In late October, locals celebrate the end of the season on Hurricane Thanksgiving Day.
The High Season & the Off Season
High season (or winter season) in the Virgin Islands, when hotel rates are at their peak, runs roughly from mid-December to mid-April. However, package and resort rates are sometimes lower in January, as a tourist slump usually occurs right after the Christmas holidays. February is the busiest month. If you're planning on visiting during the winter months, make reservations as far in advance as possible.
Off season begins when North America starts to warm up, and vacationers, assuming that temperatures in the Virgin Islands are soaring into the 100s (upper 30s Celsius), head for less tropical local beaches. However, it's actually quite balmy year-round in the Virgin Islands -- thanks to the fabled trade winds -- with temperatures varying little more than 5° between winter and summer.
There are many advantages to off-season travel in the Virgin Islands. First, from mid-April to mid-December, hotel rates are slashed a startling 25% to 50%. Second, you're less likely to encounter crowds at swimming pools, beaches, resorts, restaurants, and shops. Especially in St. Thomas and St. Croix, a slower pace prevails in the off season, and you'll have a better chance to appreciate the local culture and cuisine. Of course, there are disadvantages to off-season travel, too: Many hotels use the slower months for construction and/or restoration, fewer facilities are likely to be open, and some hotels and restaurants may close completely when business is really slow.
Additionally, if you're planning a trip during the off season and traveling alone, ask for the hotel's occupancy rate -- you may want crowds. The social scene in both the B.V.I. and the U.S.V.I. is intense from mid-December to mid-April. After that, it slumbers a bit. If you seek escape from the world and its masses, summer is the way to go, especially if you aren't depending on meeting others.
In addition to the standard legal holidays observed in the United States, U.S. Virgin Islanders also observe the following holidays: Three Kings' Day (Jan 6); Transfer Day, commemorating the transfer of the Danish Virgin Islands to the Americans (Mar 31); Organic Act Day, honoring the legislation that granted voting rights to the islanders (June 20); Emancipation Day, celebrating the freeing of the slaves by the Danish in 1848 (July 3); Hurricane Supplication Day (July 25); Hurricane Thanksgiving Day (Oct 17); Liberty Day (Nov 1); and Christmas Second Day (Dec 26). The islands also celebrate 2 carnival days on the last Friday and Saturday in April: Children's Carnival Parade and the Grand Carnival Parade.
In the British Virgin Islands, public holidays include the following: New Year's Day, Commonwealth Day (Mar 12), Good Friday, Easter Monday, Whitmonday (sometime in July), Territory Day Sunday (usually July 1), Festival Monday and Tuesday (during the first week of Aug), St. Ursula's Day (Oct 21), Birthday of the Heir to the Throne (Nov 14), Christmas Day, and Boxing Day (Dec 26).