Gustavia sea temperature today: 30°C – beach water temperature, Gustavia, Saint Barthélemy
Saint Barthélemy · Caribbean
Gustavia
Sea
29.5°C85.1°F
Air
UV
Bathtub
Above ⁦28°C⁩

Last updated ·

Today, September 13, the sea temperature at Gustavia is 29.5 °C (85 °F). That matches the usual average of 29.7 °C in September. Comfortable for swimming year-round.

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Climate · monthly averages

Sea temperature by month

5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes.

Warmest in September (29.7°C). Coldest in February (26.5°C). Comfortable for swimming year-round.

5-year averages (2021–2025). Min/Max are typical daily lows and highs, not record extremes.
MonthSea · MinSea · AvgSea · MaxAir · MinAir · AvgAir · Max
January26.6°C26.9°C27.5°C25.2°C25.5°C25.6°C
February26.0°C26.5°C26.9°C24.7°C25.1°C25.2°C
March26.1°C26.5°C27.1°C24.8°C25.2°C25.4°C
April26.4°C26.8°C27.4°C25.0°C25.5°C25.7°C
May27.2°C27.8°C28.5°C26.2°C26.6°C26.9°C
June27.8°C28.4°C29.2°C26.9°C27.3°C27.5°C
July28.1°C28.6°C29.2°C27.1°C27.6°C27.8°C
August28.6°C29.1°C29.6°C27.5°C27.9°C28.2°C
September29.2°C29.7°C30.1°C27.6°C28.0°C28.2°C
October28.9°C29.5°C30.2°C27.4°C27.8°C28.0°C
November28.3°C28.7°C29.2°C26.6°C27.0°C27.1°C
December27.3°C27.8°C28.4°C25.8°C26.1°C26.2°C

About Gustavia

Gustavia anchors the leeward shore of Saint Barthélemy at the head of the Carénage, a natural deep-water harbour that Sweden held from 1784 to 1878 and that now ranks among the Caribbean's busiest superyacht roadsteads. Anse de Grande Saline keeps its undeveloped emerald water on the south coast, while Saint-Jean Beach sits directly beneath the low-altitude landing approach into Gustaf III Airport. Sea temperatures hold between 28 and 29 °C82 and 84 °F year-round, with the SBH runway barely ten minutes by road.

Frequently asked questions

Today, September 13, the sea at Gustavia is 29.5 °C (85 °F)85 °F (29.5 °C) – bathtub-warm. The usual September average is 29.7 °C85 °F.

No single number works for everyone, so the scale on this page is only a guide to how the water feels: below 13 °C55 °F icy, 13–18 °C55–64 °F cold, 18–23 °C64–73 °F refreshing, 23–28 °C73–82 °F pleasantly warm and above 28 °C82 °F like a bath. Right now the sea at Gustavia is 29.5 °C85 °F.

Yes – the sea at Gustavia (Saint Barthélemy) stays swimmable all year. February is the coolest month, averaging 26.5 °C80 °F – ideal for swimming for most people; the warmest is September at 29.7 °C85 °F.

In September, at 29.7 °C85 °F on average. The coolest month is February at 26.5 °C80 °F – still above the 18 °C64 °F swimming line, so there is no off-season for swimming.