Seven Mile Beach sea temperature today: 31°C – beach water temperature, Seven Mile Beach, Cayman Islands
Cayman Islands · Grand Cayman
Seven Mile Beach
Sea
31.0°C87.8°F
Air
UV
Bathtub
Above ⁦28°C⁩

Last updated ·

Today, September 13, the sea temperature at Seven Mile Beach is 31 °C (88 °F). That is 0.7 °C warmer than the usual 30.3 °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 (30.3°C). Coldest in February (27.1°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
January27.2°C27.4°C27.7°C25.7°C25.9°C26.0°C
February26.9°C27.1°C27.4°C25.6°C25.8°C25.9°C
March27.0°C27.4°C27.7°C25.9°C26.3°C26.4°C
April27.4°C27.8°C28.1°C26.3°C26.6°C26.8°C
May28.2°C28.8°C29.3°C27.2°C27.6°C27.9°C
June28.5°C29.2°C29.7°C27.6°C28.0°C28.2°C
July29.2°C29.6°C30.1°C28.2°C28.7°C28.9°C
August29.6°C30.2°C30.6°C28.4°C28.9°C29.0°C
September29.7°C30.3°C30.8°C28.2°C28.8°C28.9°C
October29.6°C30.1°C30.6°C27.8°C28.1°C28.1°C
November28.9°C29.1°C29.4°C27.0°C27.3°C27.2°C
December28.1°C28.3°C28.6°C26.3°C26.6°C26.6°C

About Seven Mile Beach

Grand Cayman's western shore is fronted by Seven Mile Beach, a 6.3-kilometre strip of coral-fine sand sheltered from the easterly trade winds and edged by a reef that drops into the Cayman Trench just offshore. Across the island to the north, Rum Point opens onto a hammock-strung bay calmer still, while Smith Cove tucks a snorkelling pocket between low limestone bluffs on the southern coast. Sea temperatures hold between 28 and 29 °C82 and 84 °F from July through September, with Owen Roberts International ten minutes by road from George Town.

Frequently asked questions

Today, September 13, the sea at Seven Mile Beach is 31 °C (88 °F)88 °F (31 °C) – bathtub-warm. The usual September average is 30.3 °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 Seven Mile Beach is 31 °C88 °F.

Yes – the sea at Seven Mile Beach (Grand Cayman, Cayman Islands) stays swimmable all year. February is the coolest month, averaging 27.2 °C81 °F – ideal for swimming for most people; the warmest is September at 30.3 °C87 °F.

In September, at 30.3 °C87 °F on average. The coolest month is February at 27.2 °C81 °F – still above the 18 °C64 °F swimming line, so there is no off-season for swimming.