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Climate - United States Virgin Islands


Average weather, temperature, rainfall, sunshine

Flag - United States Virgin Islands

Map - United States Virgin Islands

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Index


  • Introduction - Charlotte Amalie
  • Sea temperature
  • Hurricanes
  • When to go
  • What to pack

Introduction



The climate of the U.S. Virgin Islands is tropical, hot all year round, with a relatively cooler period from December to March, with average highs around 29 °C (84 °F), and a hotter and sultry period from May to October, with highs around 31/32 °C (88/90 °F), during which, however, the heat is tempered by the breeze.
As regards to the rainfall, there is a relatively dry season from January to April and a rainy season from May to December, during which there's a relative decrease in precipitation in June and July. The least rainy months are February and March. Rainfall hovers around 1,000/1,200 millimeters (40/47 inches) per year and is generally slightly more abundant on the northern slopes of each island.
Starting from May, precipitation increases, though there is often a relative decrease in June and July, followed by a recovery from August to November. Generally, the wettest period runs from September to November.
The U.S. Virgin Islands are an archipelago located east of Puerto Rico, in the group of the Lesser Antilles. There are three main islands, Saint John and Saint Thomas, more to the north, and Saint Croix, to the south.

Charlotte Amalie

Climate chart - Charlotte Amalie
Climate chart - Charlotte Amalie

Here are the average temperatures of Charlotte Amalie, the capital, located on the island of Saint Thomas.
Charlotte Amalie - Average temperatures (1991-2020)
MonthMin (°C)Max (°C)Mean (°C)Min (°F)Max (°F)Mean (°F)
January23.128.926748478.8
February23.129.126.1748479
March23.229.226.2748579.2
April24.229.827768680.6
May25.330.728788782.4
June26.331.629798984.1
July26.332.129.2799084.6
August26.432.129.2809084.6
September26.431.829.1808984.4
October25.731.328.5788883.3
November24.830.327.6778781.6
December23.829.626.7758580.1
Year24.930.527.6576.88782

Considering that we are in the tropics, the rains in Charlotte Amalie are not very abundant, since they amount to 1,000 mm (40 in) per year. The only very rainy months are September, October and November. Here is the average precipitation.
Charlotte Amalie - Average precipitation
MonthMillimetersInchesDays
January50210
February351.48
March351.47
April702.88
May803.110
June702.88
July652.69
August953.712
September1405.513
October1556.114
November1405.513
December702.812
Year100539.6124

Apart from hurricanes, which can bring strong winds and torrential rains (see below), the weather is normally nice or variable, only interrupted by short showers and thunderstorms, which are more likely and more intense during the rainy season: so, the sun shines for many hours throughout the year, as you can see in the following table.
Charlotte Amalie - Sunshine hours
MonthAverageTotal
January8250
February8225
March9280
April9270
May8250
June8240
July9280
August9280
September8240
October8250
November7210
December7215
Year8.22985

Charlotte Amalie

Sea temperature



The sea in the U.S. Virgin Islands is warm enough to swim in all year round: the water temperature is around 26 °C (79 °F) in February and March and around 29 °C (84 °F) in September and October, as can be seen in the following table.
Charlotte Amalie - Sea temperature
MonthCelsius (°C)Fahrenheit (°F)
January26.580
February2679
March2679
April26.580
May27.581
June2883
July28.583
August28.584
September2984
October2984
November2883
December27.581
Year27.681.7

Hurricanes



From June to November, here as in the whole area of the West Indies, there is the danger of tropical storms and hurricanes, with greater probability from August to October. In September 2017, the island of Saint Croix was hit in full force by Hurricane Maria.

When to go



The best time to visit the U.S. Virgin Islands is from December to April, since it is the least hot period of the year and outside of the hurricane period; in particular, January, February and March are the driest months. December can still be a rainy month, especially on the southern island of Saint Croix.
In April, there is a certain increase in temperature, and during some years, also in the intensity of thunderstorms, but overall, it's still an acceptable month, and in many cases, it is good.
In summer, June and July are generally not as rainy as August and September, and have also a lower risk of tropical storms and hurricanes, which, as mentioned, are most likely between August and October, that is, when the sea is warmer and has more energy to provide.

What to pack



From December to April: pack light clothes, and possibly a scarf for the breeze and a sweatshirt for the evening.
From May to November: pack lightweight clothing, and possibly a light sweatshirt and a light raincoat for thunderstorms; a sweatshirt and a pashmina for airconditioned places.

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