What to wear in St. Thomas, and what to pack for the US Virgin Islands

What to wear in St. Thomas, month by month

The same clothes work all year; what changes is the rain. These are NOAA's 1991–2020 normals for Cyril E. King Airport, the one station with temperature normals for St. Thomas and St. John, which sits across Pillsbury Sound from Cruz Bay.

A day with rain here means 0.10 inch or more, not a day of it. February and March are the driest, with four or five such days. The tradeoff: September to November is the wettest stretch, with ten days of rain in October and November and nights that stay at 77°F to 80°F, so a light rain shell and repellent earn their space then. On St. John, the Coral Bay gauge runs wetter than the airport in the autumn, 6.3 inches in October and 7.2 in November. The sea, by the readings on our weather pages, runs from 80°F in February to 86°F in September and October, so nobody needs a wetsuit to snorkel.

Clothes for the sun and the mosquitoes

Cover more than you would expect, and pack for it: a thin long-sleeved shirt, long pants in a light fabric and a brimmed hat do more than a bag of sunscreen. The Centers for Disease Control and Prevention (CDC), on its page for the US Virgin Islands reviewed August 25, 2026, names exactly that kit, loose and lightweight clothes for the heat, long sleeves, long pants and a hat against mosquitoes, and adds clothing treated with permethrin and a repellent with 20% DEET or more.

That makes a long-sleeved shirt in a thin fabric the most useful thing in the case: it covers you on the boat at noon and on the terrace at dusk. A rash guard does the same job in the water, with less sunscreen to wash off onto the reef.

Which sunscreen the park asks you to bring

Reef-safe, and checked on the label rather than taken from it. The National Park Service asks visitors to Virgin Islands National Park, which covers much of St. John, to use sunscreen free of oxybenzone, octinoxate and octocrylene, on its safety page last updated September 2022. Its snorkeling page adds butylparaben and 4-methylbenzylidene camphor, and warns that no regulation governs what a maker prints on the bottle, so a sunscreen sold as reef safe may still contain them.

Read the active ingredients before you pack it.

What the park allows on its beaches

Leave the glass at the villa. The park's Superintendent's Compendium, last updated October 6, 2026, sets these rules for every beach in Virgin Islands National Park:

The Trunk Bay line is from the National Park Service's fees page, updated September 29, 2026: cash is no longer accepted at the Trunk Bay entrance from October 1, 2026, so bring a card or a phone that pays. The park also warns that sea urchins have long, brittle spines that break off in the skin, which is the case for shoes that can get wet on any rocky entry, and it asks hikers to bring plenty of water.

What to ask the villa owner before you pack

What a house supplies is the owner's to say, and it differs from one house to the next. Each villa page here lists the amenities its owner entered; for anything it does not mention, ask before you pack, because the answer can save a bag.

The questions worth sending with your dates: beach towels, and whether they may leave the house; beach chairs and an umbrella; a cooler for the car; snorkel gear, and in which sizes; a washing machine, which halves the clothes you need; a crib or high chair if you travel with a baby. Anything the owner does not have, you bring or buy on the island.

What you can bring home duty-free

Coming home, the duty-free allowance is $1,600 a person, per US Customs and Border Protection, with up to 5 liters of alcohol inside it, at least one of them made in the territory. Leave room in the case if you plan to use it.

The passport and entry rules are a topic of their own, with every ID and date.

Questions people ask

What to wear in St. Thomas?

Light, loose clothes, a swimsuit, a hat and a thin long-sleeved shirt. The normal high at Cyril E. King Airport is 84°F to 90°F through the year and the normal low never falls below 74°F, per NOAA's 1991–2020 normals. The CDC advises loose, lightweight clothing in the heat and long sleeves against mosquitoes, which spread dengue and Zika here.

What to bring to St. John, USVI?

The St. Thomas list, plus what the national park asks: reef-safe sunscreen, with the ingredients read rather than the label trusted, and no glass bottles, since the park bans glass on every beach as of October 2026. Bring a card or a phone that pays for Trunk Bay, which stopped taking cash on October 1, 2026, and water for any hike.

Does it get cold in St. Thomas, Virgin Islands?

No. The coolest month's normal low at Cyril E. King Airport is 74°F, in January, February and March, and the summer nights stay near 80°F, per NOAA's 1991–2020 normals. The sea, by the readings on our weather pages, runs from about 80°F in February to 86°F in the autumn. A long-sleeved shirt covers the evening; nobody needs a coat or a sweater.