Month-specific sea-surface temperature · Japan

Okinawa - Blue Cave Sea Temperature in January

22.2°C

72.0°F

In January, sea-surface temperature near Okinawa - Blue Cave has a historical monthly average of 22.2°C. This is not the reading for any particular holiday date.

Across 2023–2025, the lowest and highest yearly January monthly means were 21.7–22.6°C. These are not daily extremes.

Previous month

December · 24.0°C

Change into January: -1.8°C

Next month

February · 21.6°C

Change into next month: -0.6°C

Can you swim or snorkel in Okinawa - Blue Cave in January?

At 22.2°C our temperature-only guide describes the water as mild water. Comfort depends on your cold tolerance, immersion time and wind. A historical average cannot determine whether conditions are safe on any given day.

Do you need a wetsuit?

A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.

Which beach should you choose?

Look for a beach sheltered from the actual forecast waves and wind on your visit. Exposure, currents and entry conditions vary even where water temperatures are similar. Follow local warnings.

Check the current waves, wind and snorkeling forecast →

A live forecast does not predict a future January. Check again close to your trip.

Nearby places in January

Comparable historical averages from independent marine grid cells. Warmer water does not imply safe snorkeling.

Kerama Islands 22.3°C

Okinawa - Blue Cave Sea Temperature: All 12 Months

Choose a month for available historical evidence, month comparisons and swim guidance. Missing history is clearly marked and never presented as a long-term normal.

January 22.2°C February 21.6°C March 21.5°C April 22.8°C May 24.3°C June 26.9°C July 29.5°C August 29.7°C September 29.8°C October 28.5°C November 26.3°C December 24.0°C

Data source and limitations

Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature; 2023–2025. Marine model grid near 26.46, 127.83. Based on 3 yearly monthly means and 2166 recorded samples. Source methodology.

Modelled sea-surface temperatures do not establish underwater visibility, wildlife, calm currents or safe entry.