Weather in the USVI: Climate, Seasons, and Average Monthly Temperature

Bright blue Caribbean waters with a beach and tree covered islands
US Virgin Islands.

Steven Heap / EyEm / Getty Images

The U.S. Virgin Islands (St. John, St. Thomas, and St. Croix) are known for their sunny skies all year-round, though visitors to the islands are advised to prepare for a chance of tropical storms or possible hurricanes during the wet season. The most popular time of year to visit the U.S. Virgin Islands is also the driest time of year. Tourism is at its peak during the months of December through March, eventually tapering off in mid-April before subsiding in June and July. From monthly weather forecasts to seasonal packing lists, here is your guide for what to expect, and how to prepare, for your next visit to the U.S. Virgin Islands.

Fast Climate Facts

  • Hottest Month: August (84 F / 29 C)
  • Coldest Month:  January (79 F / 26 C)
  • Wettest Month: October (6.1 inches of rainfall)
  • Sunniest Months: August (9 hours of sunshine, 12.7 daylight hours)
  • Best Months for Swimming: September & October (average sea temperature 84 F / 29 C)

Hurricane Season in the U.S. Virgin Islands

June marks the beginning of the hurricane season in the West Indies, though the risk of tropical storms is greatest in the autumn months of September and October (not coincidentally, this is the wettest period of the year). The threat subsides in November, which is when the season officially concludes—just in time for holiday revelers to arrive for the dry season in December. The last major hurricane season to impact the U.S. Virgin Islands occurred in the fall of 2017 when two Category 5 hurricanes landed on the islands; Hurricane Irma hit St. John and St. Thomas, while Hurricane Maria landed on St. Croix. The islands have done major rebuilding since then, and the chances of being hit by a serious storm during your vacation is quite low, as such serious impact only occurs roughly every eight years.

Different Islands in the U.S. Virgin Islands

St. Thomas

The U.S. Virgin Islands consist of more than 50 inlets and cays in the eastern Caribbean, as well as three main islands for travelers to visit: St. Croix, St. John, and St. Thomas—the latter of which has long been the most popular tourist destination. If you’re looking for culture and nightlife, then St. Thomas is the most exciting spot to visit in the U.S. Virgin Islands—not to mention the most easily accessible. Thanks to Cyril E. King International Airport, travelers can book direct flights across the U.S. to the island capital of Charlotte Amalie.

St. John

From the mountains to the beach, there’s no shortage of variety in the natural beauty of the U.S. Virgin Islands, and nowhere is this better appreciated than the idyllic island of St. John. Once you land in the capital of St. Thomas, hop in a cab for the 12-minute drive to the Red Hook ferry and set sail for the 35-minute boat-ride to St. John. It’s only fitting that this island is less-accessible than the more-populated St. Thomas, as it is known for its rugged and majestic beauty. The majority of the island is protected by the Virgin Islands National Park (60 percent, to be exact).

St. Croix

Last but certainly not least, is the 84-square-mile island of St. Croix—also known as the “Big Island” of the U.S. Virgin Islands. And, similar to St. John, this island is also known for its gorgeous national park. You should definitely head out on a day trip to visit the Buck Island Reef National Monument. Located just off the northern coast of St. Croix, the uninhabited 176-acre island features a thriving coral reef and is a lush tropical paradise for sea turtles, pelicans. But St. Croix is a haven for food lovers, as well, as it is considered the culinary capital of the U.S. Virgin Islands—and Crucian cuisine is fast becoming popular outside the Caribbean, as well.

St. John
Getty / cdwheatley 

Spring in the U.S. Virgin Islands

Spring is an ideal time to visit the U.S. Virgin Islands, as prices drop in mid-April—coinciding with the departure of the last Spring Break tourists—and the wet season doesn’t begin until the summertime. The sea temperature in March and April is the coldest it will be all year, though it’s still an inviting 79 degrees F (26 C). In May, the water temperature rises slightly to 81 degrees F (27 C).

What to pack: A swimsuit, sunblock, and sun-protecting hat. Though this is the dry season, bring a lightweight rain-jacket, just in case. Additionally, a scarf or sweater is helpful in the evenings.

Average Temperatures by Month:

  • March: 86 F / 73 F (30 C / 23 C)
  • April: 86 F / 73 F (30 C / 23 C)
  • May: 88 F / 77 F (31 C / 25 C)

Summer in the U.S. Virgin Islands

Though technically the start of the wet season in the U.S. Virgin Islands, the scattered showers that occur during the early months of the summertime are more of a refreshing (momentary) reprieve from the tropical sun rather than the stirrings of a larger storm. The water temperature rises once more in the summertime, with an average of 82 degrees F (28 C) from June through August.

What to pack: Bring a swimsuit and coral reef-friendly sunblock, rain jacket, hat, and lightweight clothing for beach days and tropical evenings.

Average Temperatures by Month:

  • June: 90 F / 77 F (32 C / 25 C)
  • July: 90 F / 79 F (32 C / 26 C)
  • August: 90 F / 79 F (32 C / 26 C)

Fall in the U.S. Virgin Islands

Though fall in the U.S. Virgin Islands offers amazing travel deals, visitors looking to vacation in the U.S. Virgin Islands during the peak hurricane season of September and October should consider purchasing travel insurance as a safety precaution prior to your trip. The water temperature in early fall is the highest it will be all year, at 84 degrees F (29 C) in September and October. In November, the sea starts to cool slightly, at 82 degrees F (28 C).

What to pack: Rain-gear, waterproof clothing you don't mind getting wet—either in the tropical rainstorms or the Caribbean Sea, swimsuit and sunblock, breathable clothing to combat humidity.

Average Temperatures by Month:

  • September: 90 F / 77 F (32 C / 25 C)
  • October: 90 F / 77 F (32 C / 25 C)
  • November: 88 F / 75 F (31 C / 24 C)

Winter in the U.S. Virgin Islands

December marks the very beginning of both the dry season and the peak tourist season in the U.S. Virgin Islands—and the balmy weather is certainly enjoyed by travelers visiting for the holidays. With hurricane season finally over, beach days are all but guaranteed—the sea temperature in December is 81 F (27 C), dropping slightly to 79 F (26 C) in January and February—but be sure to book travel in advance to avoid increased airfare.

What to pack: December marks the official beginning of the dry season, but it is also the time of year when the temperature drops—relatively, speaking, for the West Indies. Pack a scarf or sweater for evenings, and—as always—don’t forget your hat and sunblock.

Average Temperatures by Month:

  • December: 86 F / 73 F (30 C / 23 C)
  • January: 84 F / 72 F (29 C / 22 C)
  • February: 86 F / 72 F (30 C / 22 C)