Saint Martin
Weather locations in Saint Martin
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Saint Martin illustrated weather map
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Climate of Saint Martin
Country climate guideSaint Martin is the French northern half of an island in the northern Caribbean, shared with the Dutch south, and it lies about 300 km east of Puerto Rico. Being small, low and almost entirely fringed by beach, its weather follows the classic Caribbean pattern of a hot humid year split into a dry season and a wet season, with steady trade winds and a real hurricane risk. The island has no significant relief, so conditions differ very little between its parts.
Main climate types
The whole island classifies as a tropical savanna climate with a pronounced dry season, bordering on tropical rainforest where the land rises slightly towards the hills behind Marigot. There are no microclimates of the mountainous kind; the only variation comes from the few hills at the centre and from the difference between the sheltered and open coasts, the western and southern bays seeing somewhat less wind and rain.
Temperatures
Temperatures are stable and warm throughout the year. Marigot averages about 25 °C in January and about 27 °C in the late summer and autumn months, the warmest period. Daytime highs typically sit near 30 °C, and the trade wind makes the coast feel cooler than the figures suggest. Nights stay mild, in the low 20s °C, so evenings outdoors are comfortable in every month. Sea temperatures follow suit, staying warm enough for swimming all year.
Rainfall
Annual rainfall is typically about 1,000 mm to 1,300 mm. The dry season runs from about December to May, when the trade winds are strongest and the island gets the most sunshine, and the wet season from June to November brings most of the rain, usually as brief heavy showers around midday or in the evening. Humidity is high for most of the year, and brief squalls can arrive very suddenly.
When to go
The dry season from January to April offers the brightest skies and the calmest conditions for beaches, snorkelling and the sheltered bays. The wet season from June to November carries the hurricane risk, which peaks in September, so travel insurance and flexible plans are worth considering.