☆ Saint Lucia Weather June 2026

Saint Lucia Climate Guide

Climate Overview

Saint Lucia has a tropical maritime climate with two distinct seasons. The drier season runs from January through April, with February and March being the driest months.

The wet season extends from June through November, driven by the Inter-Tropical Convergence Zone, with peak rainfall from July to October when monthly totals regularly exceed 200 mm7.9 in. Annual rainfall varies significantly across the island: the southern coast around Vieux Fort receives approximately 1,500 mm59 in, while Castries and the northwest coast average around 2,000 mm79 in. The mountainous interior, on the slopes of Mount Gimie, receives up to 3,800 mm150 in per year.

Daytime highs along the coast range from 29 °C84 °F in winter to 31 °C88 °F in summer, with September typically the warmest month. Overnight lows stay between 22 °C72 °F and 25 °C77 °F year-round.

Steady northeast trade winds provide natural cooling, particularly during the drier months when they blow with greater consistency. Humidity remains high throughout the year, typically between 75% and 85%, though the trade winds keep coastal conditions comfortable.

Monthly Climate Averages

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

Coastal averages (Castries area). Interior mountain rainfall is significantly higher.

Hurricane History

Saint Lucia lies in the Windward Islands at latitude 14°N, directly in the path of Cape Verde-type hurricanes entering the Caribbean. Hurricane Allen (August 4, 1980) struck as a Category 3 hurricane, with sustained winds of 167 km/h104 mph recorded at Hewanorra Airport.

Allen killed 9 people, destroyed 100% of the standing banana crop, severely damaged 80% of schools, and left approximately 9,600 people homeless. Total damage was estimated at EC$250 million. The storm was notably dry, but waves reaching 6 m20 ft nearly destroyed the coastal village of Dennery.

Hurricane Tomas (October 30, 2010) passed just south of Saint Lucia as a Category 1 hurricane, but its most devastating impact came from extreme rainfall rather than wind. Stations recorded up to 668 mm26.3 in of rain in approximately 23 hours, an event estimated to have a return period of 180 years. The resulting floods and mudslides killed 14 people, swept away homes and bridges, and tore away large portions of the island's main highway.

The ECLAC assessment estimated total damage and losses at US$336 million. More recently, Hurricane Dean (August 17, 2007) passed through the Saint Lucia Channel as a Category 2 hurricane, causing significant damage to residential structures and agricultural land, with losses estimated at US$18 million.

Geography & Terrain

Saint Lucia is a volcanic island in the Windward Islands of the Lesser Antilles, covering 617 km²238 sq mi. The island stretches roughly 43 km27 miles from north to south and 22 km14 miles at its widest point. A mountainous spine runs north to south, rising to Mount Gimie, the highest point at 950 m3,120 ft.

Near the town of Soufriere on the southwestern coast, the iconic Pitons, two volcanic spires, rise dramatically from the sea. Gros Piton reaches 798 m2,618 ft and Petit Piton stands at 743 m2,438 ft. The Pitons Management Area was inscribed as a UNESCO World Heritage Site in 2004.

The nearby Qualibou caldera, a collapsed stratovolcano 3.5 km2 miles wide, contains the Sulphur Springs, an active geothermal area with hot pools and fumaroles sometimes called the world's only "drive-in volcano."

Saint Lucia's mountainous terrain strongly influences its weather patterns. Northeast trade winds carry moisture-laden air from the Atlantic, which is forced upward by the volcanic peaks, producing heavy orographic rainfall in the interior that can be more than double the coastal totals. The windward eastern coast is wetter and more exposed, while the leeward western coast sits in a partial rain shadow and is notably drier.

The island's volcanic soils and abundant rainfall sustain dense tropical rainforest across the interior highlands. This same terrain makes the island particularly vulnerable to flash flooding and landslides during heavy rainfall events, as demonstrated by the catastrophic mudslides during Hurricane Tomas in 2010.

Climate normals based on published data from multiple meteorological sources including Hewanorra Airport and Castries records. Monthly values are approximate long-term averages for coastal locations.