Devil's Island sea temperature today: 29°C – beach water temperature, Devil's Island, French Guiana
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French Guiana · Salvation Islands
Devil's Island
Sea
28.7°C83.7°F
Air
–
UV
–
Bathtub
Above ⁦28°C⁩

Last updated ·

Today, September 13, the sea temperature at Devil's Island is 28.7 °C (84 °F). That matches the usual average of 28.5 °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 July (28.7°C). Coldest in February (27.3°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
January26.8°C27.4°C27.8°C25.6°C26.0°C26.1°C
February26.9°C27.3°C27.8°C25.7°C26.1°C26.2°C
March27.3°C27.6°C28.4°C26.0°C26.4°C26.5°C
April27.5°C27.8°C28.4°C26.0°C26.5°C26.6°C
May27.9°C28.2°C28.6°C25.9°C26.4°C26.7°C
June28.3°C28.5°C28.7°C25.6°C26.4°C26.8°C
July28.5°C28.7°C28.9°C25.9°C26.6°C27.1°C
August28.2°C28.4°C28.7°C26.3°C27.1°C27.6°C
September28.2°C28.5°C28.8°C26.8°C27.5°C27.9°C
October28.3°C28.7°C29.0°C27.0°C27.6°C27.8°C
November28.0°C28.2°C28.4°C26.3°C26.9°C27.1°C
December27.6°C27.8°C28.2°C25.9°C26.4°C26.5°C

About Devil's Island

Devil's Island is the smallest of the three Salvation Islands, 15 kilometres off French Guiana's Atlantic coast, and infamous for the 1852–1953 French penal colony that held Alfred Dreyfus in solitary confinement from 1895 to 1899. Henri Charrière's 1969 memoir Papillon cemented the archipelago's reputation; neighbouring Île Royale carries the prison ruins, while Île Saint-Joseph hides the isolation cells in the jungle. Swimming is not the point here, as strong currents keep visitors focused on colonial history; the equatorial sea stays at 27–28 °C81–82 °F year-round.

Frequently asked questions

Today, September 13, the sea at Devil's Island is 28.7 °C (84 °F)84 °F (28.7 °C) – bathtub-warm. The usual September average is 28.5 °C83 °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 Devil's Island is 28.7 °C84 °F.

Yes – the sea at Devil's Island (Salvation Islands, French Guiana) stays swimmable all year. February is the coolest month, averaging 27.3 °C81 °F – ideal for swimming for most people; the warmest is July at 28.7 °C84 °F.

In July, at 28.7 °C84 °F on average. The coolest month is February at 27.3 °C81 °F – still above the 18 °C64 °F swimming line, so there is no off-season for swimming.