Vitamin D in U.S. Virgin Islands: Best Months, UV and Travel Guide

The best months for vitamin D in U.S. Virgin Islands are June, July, October, December to March. In March, a full dose of about 1,000 IU takes around 6 minutes at midday for skin type III at age 30, with 8.4 usable sun hours a day. For a beach stay it is rainy or stormy from April to May and from August to September and in November.

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U.S. Virgin Islands month by month

U.S. Virgin Islands is rated at its median coastal place, for skin type III at age 30. Click a month for the details.

Month	Rating	Sun window	Peak UV	Full dose, age 30	Full dose, age 65	Afternoon high	Rainy days
January	Excellent	7.1 h	6.8	8 min	15 min	29°C	10/30
February	Excellent	7.3 h	7.5	7 min	13 min	26°C	14/30
March	Excellent	8.4 h	8.7	6 min	11 min	26°C	6/30
April	Bad weather	8.8 h	9.0	6 min	11 min	29°C	20/30
May	Bad weather	8.9 h	8.9	6 min	11 min	30°C	19/30
June	Excellent	9.0 h	8.7	6 min	11 min	31°C	16/30
July	Excellent	8.7 h	8.7	6 min	11 min	29°C	16/30
August	Bad weather	8.6 h	8.7	6 min	11 min	29°C	16/30
September	Bad weather	8.5 h	8.6	6 min	12 min	30°C	19/30
October	Excellent	7.6 h	7.5	7 min	13 min	30°C	14/30
November	Bad weather	6.6 h	6.1	9 min	16 min	29°C	22/30
December	Good	6.8 h	6.3	8 min	16 min	29°C	16/30

Sun window is the number of hours a day with UV Index 2.5 or higher. Full dose is the minutes at midday for about 1,000 IU of vitamin D with a quarter of the body bare, for skin type III. Rainy days are days with at least 1 mm out of 30.

Travel guide: why go to U.S. Virgin Islands

Why go

The US Virgin Islands offer easy, US-style Caribbean travel with calm turquoise bays and national park beaches on St. John.

Best for

Couples, families, snorkellers and sailors.

What to expect

A dry, pleasant season from December to April, and hurricane risk from June to November. US citizens need no passport, and driving is on the left.

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Places in U.S. Virgin Islands

Each place has its own climate, so its best months can differ from the country as a whole.

Charlotte Amalie best: Excellent

Capital and cruise port with historic buildings.

Best for shoppers, cruise travellers

Best months October, December to July · Avoid rainy or stormy from August to September and in November

Cruz Bay best: Excellent

St. John's small ferry town and gateway to the national park.

Best for couples, hikers

Best months January to March, July, October · Avoid rainy or stormy from April to June and from August to September and from November to December

Christiansted best: Excellent

Danish-era town on St. Croix with a boardwalk and forts.

Best for history fans, couples

Best months June, October, December to March · Avoid rainy or stormy from April to May and from July to September and in November

Magens Bay best: Excellent

Heart-shaped bay with calm, shallow water.

Best for families, couples

Best months October, December to July · Avoid rainy or stormy from August to September and in November

Trunk Bay best: Excellent

National park beach with an underwater snorkel trail.

Best for snorkellers, families

Best months January to March, July, October · Avoid rainy or stormy from April to June and from August to September and from November to December

Questions about vitamin D in U.S. Virgin Islands

When is the best time to visit U.S. Virgin Islands for vitamin D?

The best months for vitamin D in U.S. Virgin Islands are June, July, October, December to March. In March, a full dose of about 1,000 IU takes around 6 minutes at midday for skin type III at age 30, with 8.4 usable sun hours a day.

Can you get vitamin D from the sun in U.S. Virgin Islands in November?

Yes, but slowly. In November a full dose takes about 9 minutes at midday for skin type III at age 30, with 6.6 usable hours a day.

How long do I need in the sun in U.S. Virgin Islands?

In March, the best month, about 6 minutes at midday with a quarter of the body bare, for skin type III at age 30; about 11 minutes at age 65. Darker skin needs longer and fair skin burns sooner, so keep sessions short. This is an estimate for planning, not medical advice.

Which months should I avoid in U.S. Virgin Islands?

For a beach stay, avoid the months when it is rainy or stormy from April to May and from August to September and in November.

What is the best place in U.S. Virgin Islands for vitamin D?

In March the strongest sun of the places we rate is around Cruz Bay. Each place has its own rating, so open the place list to compare them.

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Vitamin D in U.S. Virgin Islands: best months for sun and a travel guide