St Martin has what most Caribbean islands promise but not all deliver: genuinely good weather almost year-round. The trade winds keep temperatures comfortable even in the hottest months, the dry season is long and reliable, and the rainy season is more a series of afternoon showers than a sustained grey stretch.
That said, there are real differences between months — in crowd levels, prices, rainfall, and hurricane risk. This guide gives you the actual numbers by month so you can plan around what matters to you.
St Martin sits at 18 degrees north latitude, which puts it squarely in the tropical Caribbean belt. Average air temperatures range from 77°F (25°C) in January and February to 86°F (30°C) in August and September. Sea temperatures stay between 79°F and 84°F (26°C to 29°C) year-round — always swimmable, always warm.
The trade winds blow from the northeast almost constantly, which is what makes the heat feel manageable. On the French side, the windward (Atlantic) coast — Orient Beach, Grand Case — gets slightly more breeze and occasional chop. The leeward (Caribbean) side — Baie Rouge, Baie Longue, Simpson Bay — tends to be calmer and more sheltered.
Rainfall is the main variable. The dry season runs roughly December through April. The wet season peaks in September and October, which also overlaps with peak hurricane activity in the Atlantic basin. July and August sit in the middle — warmer and more humid than the dry season, but not dramatically rainy on most days.
| Month | Air temp | Sea temp | Rain days | Hurricane risk | Verdict |
|---|---|---|---|---|---|
| January | 77–82°F / 25–28°C | 79°F / 26°C | 7 | None | Peak season. Best weather, highest prices, most crowded. |
| February | 77–82°F / 25–28°C | 79°F / 26°C | 6 | None | Peak season. Driest month of the year. Book well in advance. |
| March | 78–83°F / 26–28°C | 80°F / 27°C | 7 | None | Still peak. Spring break crowds arrive mid-month. |
| April | 79–84°F / 26–29°C | 81°F / 27°C | 8 | None | End of high season. Crowds thin after Easter. Excellent value. |
| May | 80–85°F / 27–29°C | 82°F / 28°C | 11 | Very low | Shoulder season begins. Good value, quieter beaches. |
| June | 82–86°F / 28–30°C | 83°F / 28°C | 12 | Low | Warm, humid, still mostly sunny. Good for budget travelers. |
| July | 83–87°F / 28–31°C | 84°F / 29°C | 14 | Low–moderate | Hottest month. French families arrive (Bastille Day). More lively than June. |
| August | 83–87°F / 28–31°C | 84°F / 29°C | 16 | Moderate | Busier than expected — European summer holidays. Hurricane watch begins. |
| September | 82–87°F / 28–31°C | 84°F / 29°C | 17 | High | Peak hurricane month. Most hotels offer heavy discounts. Not recommended. |
| October | 82–86°F / 28–30°C | 84°F / 29°C | 16 | High | Still high risk. Rainy. Island quietest of the year. |
| November | 80–85°F / 27–29°C | 82°F / 28°C | 13 | Low | Shoulder season. Risk drops fast. Good value before peak rates kick in. |
| December | 78–83°F / 26–28°C | 80°F / 27°C | 9 | None | High season begins mid-December. Christmas week is the most expensive of the year. |
December through April is when St Martin is at its most photogenic and its most expensive. Humidity drops, the trade winds pick up just enough to make 82°F feel comfortable, and the island fills with visitors from North America and Europe who have the same idea. January and February are the driest months of the year — some years you can go three weeks without seeing meaningful rain.
The practical consequences: villas and hotels book up months in advance, restaurant wait times get real at peak hours, and Orient Beach reaches the kind of density that makes Friar’s Bay and Happy Bay feel like insider secrets. If you’re coming in February or during spring break in March, book everything early — accommodation, car rental, catamaran tours. The good stuff goes first.
Christmas week and New Year run at a premium that surprises people who haven’t visited before. It’s the highest-demand period on the island. If that’s your window, plan six months ahead or be prepared to pay for last-minute availability.
May, June, and November are the months that reward people who plan ahead but don’t need to travel with the crowd. The weather is still very good — warm, mostly sunny, light rain — and the island feels more like it belongs to itself. Beaches are quieter. Restaurants are easier to get into. Rental car availability is not a problem.
The tradeoff in May and June is humidity, which is noticeably higher than the dry season. It’s not oppressive — the trade winds help — but mornings and evenings feel stickier. Rain tends to come as short afternoon showers rather than all-day grey. By late afternoon, the sky usually clears.
November is arguably the best value month on the island. Hurricane risk has essentially dropped to zero by mid-November, rates haven’t yet shifted to high-season pricing, and the weather is moving back toward dry season conditions. If you have flexibility in your schedule, November is worth a serious look.
The Atlantic hurricane season runs officially from June 1 to November 30, but the real risk window for St Martin is September and October. These are the two months I’d genuinely advise against for most travelers — not because storms are inevitable, but because the risk is real enough that travel insurance becomes complicated and many properties close or operate at minimal capacity.
The island’s hurricane history is a matter of record. Irma in September 2017 was catastrophic — the most powerful Atlantic hurricane on record at the time, and it caused severe damage across the island. Recovery took years. The island rebuilt well, but the memory of that kind of event is part of how locals here think about September.
July and August are more nuanced. The statistical risk is lower than September, and both months see real tourist traffic — particularly August, when European families arrive for summer holidays. Most years, July and August pass without incident. If you do travel during this window, buy comprehensive travel insurance that explicitly covers hurricane cancellations, and monitor the National Hurricane Center forecasts as your travel dates approach.
The National Hurricane Center (nhc.noaa.gov) is the only source worth checking for real-time storm tracking.
The packing list for St Martin is short regardless of when you travel. The island is casual — genuinely casual, not “resort casual” — and even the nicer restaurants on the Grand Case strip don’t require much beyond a clean shirt and shoes.
For the dry season (December–April): light cotton and linen clothing, a swimsuit or three, reef-safe sunscreen, sunglasses, a hat, and one light layer for air-conditioned restaurants and evening breezes. Sandals cover 90% of your footwear needs.
For the wet season (July–October): add a compact rain jacket or packable poncho. Afternoon showers move through quickly, but if you’re at Baie Rouge or Anse Marcel without shelter when one hits, you’ll be glad you brought it. Humidity means breathable fabrics matter more — linen over synthetic blends.
Year-round: a power bank, good waterproof phone case if you’re doing water activities, and an eSIM loaded before you land so you have maps and connectivity from the moment you clear arrivals.
An eSIM is the easiest way to stay connected on both sides of the island without paying roaming charges. Load it before you leave home — it activates when you land at SXM. Airalo offers Caribbean plans that cover both the French and Dutch sides on a single data package.
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December through April is the dry season and the most consistently reliable time to visit. January and February are the driest months. If you want good weather without the peak-season crowds and prices, November and early May are excellent alternatives.
December marks the start of high season. Temperatures range from 78 to 83°F (26 to 28°C), rainfall is low, and the trade winds keep conditions comfortable. Christmas week is the most expensive and most in-demand period of the year — book accommodation and car rental well in advance.
Yes. The peak hurricane risk window is September and October. The island was severely impacted by Hurricane Irma in September 2017. July and August carry lower but still present risk. December through June has essentially no hurricane risk. If you travel in July or August, buy travel insurance that explicitly covers hurricane cancellations.
Average highs peak in July, August, and September at around 87°F (31°C). The trade winds make the heat feel more manageable than the raw temperature suggests. The coolest months are January and February, with average highs around 82°F (28°C). Sea temperatures stay between 79°F and 84°F year-round.
Yes, with caveats. July and August are warm and humid but mostly sunny, and the island is lively — particularly in August when European families arrive. Hurricane risk is present but statistically lower than September and October. Buy travel insurance and monitor forecasts. Most years pass without incident.
The wet season runs from roughly June through November, peaking in September and October. Rain typically comes as short afternoon showers rather than extended grey periods. September and October average 16 to 17 rain days per month. The dry season (December to April) averages 6 to 9 rain days per month.
Light breathable clothing (linen or cotton), swimwear, reef-safe sunscreen, a hat, sunglasses, and sandals cover most situations year-round. Add a light rain jacket if visiting July through October. The island is genuinely casual — you will not need formal clothes for any restaurant on the island.
I've lived in St Martin for 25 years — and I'm an epicurean at heart, in love with my island. I've been giving out insider tips for almost 15 years.
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