Cayo Largo (Cuba) sea temperature today: 31°C – beach water temperature, Cayo Largo (Cuba), Cuba
Cuba · Caribbean
Cayo Largo
Sea
31.1°C88.0°F
Air
UV
Bathtub
Above ⁦28°C⁩

Last updated ·

Today, September 13, the sea temperature at Cayo Largo is 31.1 °C (88 °F). That is 0.5 °C warmer than the usual 30.6 °C in September. Comfortable for swimming year-round.

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 (30.6°C). Coldest in February (26.6°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
January26.5°C26.8°C27.1°C24.1°C24.7°C25.2°C
February26.4°C26.6°C26.9°C24.4°C25.0°C25.6°C
March26.8°C27.1°C27.2°C24.9°C25.6°C26.3°C
April27.3°C27.5°C27.9°C25.4°C26.2°C26.9°C
May28.4°C28.9°C29.4°C26.8°C27.5°C28.1°C
June28.9°C29.5°C30.0°C27.5°C28.0°C28.4°C
July29.6°C30.1°C30.7°C28.3°C28.8°C29.3°C
August30.0°C30.6°C31.1°C28.5°C29.0°C29.5°C
September30.0°C30.6°C31.0°C28.1°C28.7°C29.1°C
October29.5°C29.9°C30.4°C27.2°C27.8°C28.3°C
November28.5°C28.7°C28.9°C26.0°C26.6°C27.2°C
December27.2°C27.6°C27.9°C25.0°C25.6°C26.2°C

About Cayo Largo

Cayo Largo del Sur is a 25-kilometre cay in the Canarreos Archipelago off Cuba's south coast, run as a closed all-inclusive enclave with no permanent population, a Granja de Tortugas sanctuary protecting green and hawksbill nesting sites, and resident iguana colonies. On the southwestern tip, Playa Sirena curves two kilometres of powder-white sand into sheltered shallows, while Playa Paraíso forms a smaller palm-fringed cove just to the north. Sea temperatures hold between 28 and 29 °C82 and 84 °F year-round, with Vilo Acuña airport ten minutes from the resort strip.

Frequently asked questions

Today, September 13, the sea at Cayo Largo is 31.1 °C (88 °F)88 °F (31.1 °C) – bathtub-warm. The usual September average is 30.6 °C87 °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 Cayo Largo is 31.1 °C88 °F.

Yes – the sea at Cayo Largo (Cuba) stays swimmable all year. February is the coolest month, averaging 26.7 °C80 °F – ideal for swimming for most people; the warmest is September at 30.6 °C87 °F.

In September, at 30.6 °C87 °F on average. The coolest month is February at 26.7 °C80 °F – still above the 18 °C64 °F swimming line, so there is no off-season for swimming.