Sea temperature in Saint Martin
Live water temperatures and swimming conditions across 1 beaches on the Saint Martin coast.
Best time to swim in Saint Martin
The sea in Saint Martin peaks in June, when the water averages around 28°C.
The main swimming season runs from January – December, when surface temperatures stay comfortable for extended sessions.
On average, 12 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
The coldest month is typically January at around 24°C, when cold-water swimmers dominate the coast.
Saint Martin sea temperature history
Long-term climatology for Saint Martin shows an annual mean sea temperature of 26°C, ranging from 24°C in winter to 28°C at the summer peak.
The seasonal swing is roughly 4°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Saint Martin, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Values are area averages; individual beaches vary by exposure and depth.
Saint Martin sea temperature: frequently asked questions
What is the warmest month to swim in Saint Martin?
June is the warmest month in Saint Martin, when the sea averages about 28°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Saint Martin?
The coldest month in Saint Martin is typically January, when the water averages around 24°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Saint Martin without a wetsuit?
The main swimming season in Saint Martin runs from January – December — about 12 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Saint Martin?
Saint Martin stays warm year-round, so most swimmers never need a wetsuit — a rash guard is usually enough for sun and wildlife protection.
What is the average sea temperature in Saint Martin?
The long-term annual mean sea temperature in Saint Martin is about 26°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Saint Martin?
The live reading at the top of this page shows the current sea temperature in Saint Martin, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Warmest beaches in Saint Martin right now
| Beach | Region | Sea | Swim score |
|---|---|---|---|
| Orient Bay | Saint Martin | — | — |