Travel time: Year-round
Charlotte Amalie, the capital of the U.S. Virgin Islands, is defined by a tropical savanna climate. This results in warm temperatures throughout the year with relatively modest seasonal variation. The environment is heavily influenced by the surrounding Caribbean Sea and Atlantic Ocean, which act as thermal buffers to prevent extreme heat or cold.
Rainfall typically occurs in short, intense bursts—often referred to by locals as "passing showers." These quick downpours are usually followed by bright sunshine, meaning that even on a "rainy" day, the sun is likely to be visible for several hours.
The rhythm of the day in Charlotte Amalie is remarkably consistent:
While there are no traditional "winters" or "summers," the climate shifts through distinct phases based on wind and rainfall.
This is often considered the most pleasant time of year. Rainfall is at its lowest, particularly in February and March. Humidity levels drop, and the sky is at its clearest. A notable phenomenon during this period is the "Christmas Winds," which are stronger-than-usual trade winds that blow from the east/northeast, often bringing choppy seas but keeping the land exceptionally cool.
Temperatures begin to rise, and humidity becomes more noticeable. May often sees a brief "mini-rainy season" before a drier spell in June and July. This period is also known for Saharan Dust—fine particles of sand blown across the Atlantic from Africa, which can create hazy horizons and vibrant, albeit muted, sunsets while temporarily suppressing rainfall.
This is the hottest and most humid time of year. Daytime highs frequently hit their annual peak. September and October are statistically the wettest months, and the threat of tropical cyclones is highest. While many days remain sunny, this window carries the risk of organized storms that can bring heavy rain and high winds.
St. Thomas is a rugged, volcanic island, and its topography creates distinct microclimates:
Historically, the U.S. Virgin Islands have been shaped by significant hurricanes, most notably Hurricane Hugo (1989) and the twin impacts of Irma and Maria (2017). These events have dictated local building codes, with most structures featuring heavy-duty shutters and cisterns to collect the frequent tropical rainwater.
A unique local phenomenon is the "Groundswell." During the winter months, large northern swells generated by distant storms in the North Atlantic can reach the islands. While the weather in Charlotte Amalie may be perfectly sunny, these swells can cause massive waves on the north shore, even while the south harbor remains calm.
Locals have a deep respect for the "power of the sun" and the "refreshment of the rain." You will often see residents adapting to the heat by moving slower during the peak afternoon hours and utilizing natural ventilation in traditional West Indian architecture. Rain is rarely seen as a negative; it is the lifeblood of the islands, as most homes rely on cisterns to collect and store rainwater for daily use.
Because of the high humidity (often averaging 70-75%), the "RealFeel" or heat index is almost always higher than the actual thermometer reading. In the summer, an 88°F day can easily feel like 98°F. However, the trade winds are the great equalizer—without them, the tropical heat would be oppressive. In the winter, the lower humidity and consistent breezes create a "crisp" tropical feel that is considered the island's most comfortable weather.