French Guiana · Salvation Islands
Devil's Island
Sea
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Air
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UV
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More like this
Climate · monthly averages
Sea temperature by month
30-year averages (1996–2025). Min/Max are typical daily lows and highs, not record extremes.
75°F
79°F
82°F
86°F
90°F
January
80.7°F(80°F–82°F)
February
80.6°F(80°F–81°F)
March
81.2°F(80°F–82°F)
April
81.6°F(81°F–83°F)
May
82.1°F(81°F–83°F)
June
82.5°F(82°F–84°F)
July
83.0°F(82°F–84°F)
August
82.8°F(82°F–84°F)
September
82.4°F(82°F–83°F)
October
82.7°F(82°F–84°F)
November
82.4°F(82°F–83°F)
December
81.5°F(80°F–82°F)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MinMin °F | 8079.9 | 8079.9 | 8080.3 | 8180.7 | 8181.2 | 8281.7 | 8282.2 | 8281.8 | 8281.5 | 8281.7 | 8281.6 | 8080.4 |
| AvgAvg °F | 8180.7 | 8180.6 | 8181.2 | 8281.6 | 8282.1 | 8382.5 | 8383.0 | 8382.8 | 8282.4 | 8382.7 | 8282.4 | 8281.5 |
| MaxMax °F | 8281.6 | 8181.3 | 8282.1 | 8382.8 | 8383.2 | 8483.7 | 8483.9 | 8483.8 | 8383.4 | 8484.1 | 8383.4 | 8282.5 |
Warmest in July (83.0°F). Coldest in February (80.6°F). Comfortable for swimming year-round.
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 °C year-round.