Tokashiki Island sea temperature today: 29°C – beach water temperature, Tokashiki Island, Japan
Japan · Okinawa
Tokashiki Island
Sea
28.5°C83.3°F
Air
UV
Bathtub
Above ⁦28°C⁩

Last updated ·

Today, September 13, the sea temperature at Tokashiki Island is 28.5 °C (83 °F). That is 0.8 °C cooler than the usual 29.3 °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 (29.3°C). Coldest in February (21.9°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
January22.2°C22.6°C23.1°C18.0°C18.1°C18.1°C
February21.4°C21.9°C22.5°C18.4°C18.6°C18.7°C
March22.0°C22.2°C22.5°C19.9°C20.1°C20.2°C
April22.4°C23.0°C23.4°C21.8°C22.0°C22.2°C
May24.6°C24.9°C25.4°C24.1°C24.2°C24.4°C
June26.6°C27.2°C27.9°C26.8°C26.9°C27.0°C
July28.3°C29.2°C30.0°C28.3°C28.6°C28.8°C
August28.2°C29.3°C30.2°C28.2°C28.6°C28.7°C
September28.7°C29.3°C30.0°C27.9°C28.3°C28.4°C
October27.5°C28.1°C29.0°C26.3°C26.6°C26.6°C
November25.7°C26.2°C26.8°C23.2°C23.5°C23.5°C
December23.8°C24.1°C24.3°C19.8°C20.0°C20.0°C

About Tokashiki Island

Tokashiki is the largest of the Kerama Islands, the Okinawan archipelago whose water is so transparent that locals coined the term Kerama Blue and Japan declared the whole group its 31st national park in 2014. On the west coast, Aharen Beach curves 800 metres of fine white sand around a sheltered reef lagoon, while Tokashiku Beach two kilometres north stays quieter, regularly drawing sea turtles into its shallows and humpback whales offshore. Sea temperatures hold 27–29 °C81–84 °F from July to September.

Frequently asked questions

Today, September 13, the sea at Tokashiki Island is 28.5 °C (83 °F)83 °F (28.5 °C) – bathtub-warm. The usual September average is 29.3 °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 Tokashiki Island is 28.5 °C83 °F.

Yes – the sea at Tokashiki Island (Okinawa, Japan) stays swimmable all year. February is the coolest month, averaging 21.9 °C71 °F – refreshing, good for a short swim; the warmest is September at 29.3 °C85 °F.

In September, at 29.3 °C85 °F on average. The coolest month is February at 21.9 °C71 °F – still above the 18 °C64 °F swimming line, so there is no off-season for swimming.