Hong Kong sea temperature today: 29°C – beach water temperature, Hong Kong, Hong Kong
Hong Kong · South China Sea
Hong Kong
Sea
28.8°C83.8°F
Air
UV
Bathtub
Above ⁦28°C⁩

Last updated ·

Today, September 13, the sea temperature at Hong Kong is 28.8 °C (84 °F). That matches the usual average of 29 °C in September. Comfortable for swimming year-round.

Beachfront hotels in this photo: Four Seasons Hotel Hong Kong.

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 (29.7°C). Coldest in January (19.7°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
January18.6°C19.7°C20.9°C15.4°C16.6°C18.1°C
February19.2°C20.2°C20.9°C16.4°C17.6°C19.0°C
March20.5°C21.5°C22.5°C19.4°C20.5°C21.9°C
April22.8°C23.8°C25.2°C22.4°C23.5°C24.9°C
May25.5°C26.6°C28.0°C25.1°C26.1°C27.3°C
June28.2°C28.6°C29.0°C27.1°C28.0°C28.9°C
July29.4°C29.7°C30.1°C27.9°C29.1°C30.3°C
August28.8°C29.2°C29.6°C27.3°C28.4°C29.5°C
September28.4°C29.0°C29.5°C27.1°C28.3°C29.7°C
October27.0°C27.6°C28.0°C24.5°C25.8°C27.2°C
November23.9°C24.6°C25.2°C20.9°C22.2°C23.7°C
December21.0°C21.8°C22.4°C16.5°C17.8°C19.4°C

About Hong Kong

The South China Sea waterfront of the territory centres on Victoria Harbour, the deep natural channel separating Hong Kong Island from Kowloon and lit nightly since 2004 by A Symphony of Lights, the Guinness-listed sound-and-light show across both skylines. Repulse Bay curves along the island's south shore with lifeguards and a Tin Hau temple, calm and family-grade; Big Wave Bay on the east coast draws surfers to open swell. Sea temperatures hold between 27 and 29 °C81 and 84 °F from July through September, with Chek Lap Kok 40 minutes by Airport Express.

Frequently asked questions

Today, September 13, the sea at Hong Kong is 28.8 °C (84 °F)84 °F (28.8 °C) – bathtub-warm. The usual September average is 29 °C84 °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 Hong Kong is 28.8 °C84 °F.

Yes – the sea at Hong Kong (South China Sea, Hong Kong) stays swimmable all year. January is the coolest month, averaging 19.7 °C67 °F – refreshing, good for a short swim; the warmest is July at 29.7 °C85 °F.

In July, at 29.7 °C85 °F on average. The coolest month is January at 19.7 °C67 °F – still above the 18 °C64 °F swimming line, so there is no off-season for swimming.