☆ Saint Thomas Weather June 2026

Saint Thomas Climate Guide

Climate Overview

Saint Thomas has a tropical maritime climate with a dry season from January through April and a wet season from May through December. A relative lull in rainfall often occurs in June and July before the wettest months of September through November.

Annual rainfall in Charlotte Amalie averages approximately 1,050 mm41 in, though higher elevations on the island's ridgelines can receive considerably more. The driest months are February and March, each averaging roughly 50 mm2.0 in, while September and November are the wettest at around 150 mm5.9 in.

Daytime highs range from 29 °C84 °F in winter to 32 °C90 °F in summer, with overnight lows between 23 °C73 °F and 26 °C79 °F. Easterly trade winds blow year-round at 16-24 km/h10-15 mph, keeping humidity manageable and providing natural cooling.

The winds shift from east-northeast in winter to east-southeast in summer, and most rain showers are brief tropical downpours that pass within minutes.

Monthly Climate Averages

Long-term average temperature and rainfall for Saint Thomas by month.

Hurricane History

Saint Thomas lies in an active hurricane corridor in the northeastern Caribbean. The San Felipe II (Okeechobee) Hurricane (1928, Category 5) passed just south of the island with winds near 255 km/h160 mph, causing heavy damage.

Hurricane Hugo (1989, Category 4) tracked south of Saint Thomas on September 18 with sustained winds near 210 km/h130 mph. While the eye passed over Saint Croix, Saint Thomas experienced extensive damage to structures and infrastructure on its south shore.

Hurricane Marilyn (1995, Category 2) was far more destructive locally, with its eyewall passing directly over the western part of Saint Thomas on September 15. The airport recorded sustained winds of 170 km/h105 mph with gusts to 210 km/h130 mph. Marilyn destroyed or damaged roughly 80% of buildings and caused an estimated $2.1 billion in damage across the territory, with most of the destruction centred on Saint Thomas.

Hurricane Irma (2017, Category 5) was the most powerful storm to strike in recorded history. On September 6, Irma's southern eyewall passed directly over Saint Thomas with maximum sustained winds near 300 km/h185 mph. The storm stripped vegetation from the hillsides, destroyed or severely damaged the majority of buildings, and caused three deaths on the island.

Just two weeks later, Hurricane Maria (2017, Category 5) passed to the south on its way to Saint Croix and Puerto Rico. Although Maria's core missed Saint Thomas, the island experienced tropical-storm-force winds and heavy rainfall that triggered flooding and mudslides, compounding the damage from Irma. The combined damage from both storms across the USVI was estimated at $10.8 billion, and full power restoration took months.

Geography & Terrain

Saint Thomas is the second largest of the three main U.S. Virgin Islands, covering 83 km²32 sq mi. The island is roughly 21 km13 miles long and 5 km3 miles wide, with a hilly volcanic spine running east to west. Crown Mountain, the highest point in all of the U.S. Virgin Islands, reaches 474 m1,555 ft in the island's interior.

Charlotte Amalie, the territorial capital and one of the busiest cruise ports in the Caribbean, sits on the south coast in a deep natural harbour. The neighbouring island of Saint John lies just 5 km3 miles to the east across Pillsbury Sound, while the British Virgin Islands begin immediately to the northeast.

The steep, rugged terrain creates noticeable microclimates across the island. Windward slopes facing the northeast trade winds receive more rainfall and support denser tropical vegetation, while the leeward southern coast and harbour areas of Charlotte Amalie tend to be drier and warmer.

Higher elevations around Crown Mountain are frequently capped with orographic clouds and can receive significantly more rain than the coastal lowlands. The island's narrow profile and steep hillsides also make it vulnerable to flash flooding and mudslides during heavy rainfall events, particularly during the peak hurricane season from August through November.

Climate normals based on published data from multiple meteorological sources including Cyril E. King Airport and Charlotte Amalie station records. Monthly values are approximate long-term averages.