Cancún sea temperature today: 29°C – beach water temperature, Cancún, Mexico
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Mexico · Caribbean
Cancún
Sea
29.4°C84.9°F
Air
–
UV
–
Bathtub
Above ⁦28°C⁩

Last updated ·

Today, September 13, the sea temperature at Cancún is 29.4 °C (85 °F). That matches the usual average of 29.6 °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 August (29.6°C). Coldest in February (26.8°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
January26.7°C27.0°C27.3°C24.9°C25.1°C25.1°C
February26.7°C26.8°C26.9°C25.0°C25.3°C25.4°C
March26.8°C27.0°C27.2°C25.7°C25.9°C26.1°C
April27.3°C27.4°C27.6°C26.1°C26.4°C26.6°C
May27.9°C28.3°C28.7°C27.2°C27.5°C27.7°C
June28.4°C28.9°C29.4°C27.5°C27.8°C27.9°C
July29.0°C29.3°C29.7°C28.2°C28.5°C28.6°C
August29.2°C29.6°C30.0°C28.3°C28.6°C28.6°C
September29.1°C29.6°C30.1°C27.9°C28.3°C28.3°C
October29.1°C29.5°C29.9°C27.2°C27.6°C27.7°C
November28.5°C28.7°C28.8°C26.3°C26.6°C26.6°C
December27.5°C27.8°C28.0°C25.6°C25.8°C25.8°C

About Cancún

At the northeastern tip of the Yucatán Peninsula, Cancún's Zona Hotelera traces a 22-kilometre L-shaped barrier island that pens the Nichupté Lagoon against the Caribbean Sea. Toward the southern end, Playa Delfines spreads wide public sand below a clifftop mirador, while Playa Tortugas anchors a calmer northern cove where ferries leave for Isla Mujeres. Sea temperatures hold between 27 and 29 °C81 and 84 °F from May through October, with Cancún International Airport about 20 minutes from the strip.

Frequently asked questions

Today, September 13, the sea at Cancún is 29.4 °C (85 °F)85 °F (29.4 °C) – bathtub-warm. The usual September average is 29.6 °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 Cancún is 29.4 °C85 °F.

Yes – the sea at Cancún (Mexico) stays swimmable all year. February is the coolest month, averaging 26.8 °C80 °F – ideal for swimming for most people; the warmest is August at 29.7 °C85 °F.

In August, at 29.7 °C85 °F on average. The coolest month is February at 26.8 °C80 °F – still above the 18 °C64 °F swimming line, so there is no off-season for swimming.