Ishigaki Sea Temperature
Updated Sat 17:50 (Asia/Tokyo)
Japan · Forecast updated Sep 5, 2026, 17:50 UTC
Current Sea Temperature
29.5°C
85.1°F
Very warm water
Versus this month's average
Close to average
The September average in our archive is 29.3°C (84.7°F).
Recent trend
Holding fairly steady
Seven-day average: 29.2°C, versus 29.0°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions.
Sea Surface Temperature Over the Year
In the data collected for Ishigaki, monthly averages range from about 28.8°C (83.8°F) in June to 29.9°C (85.8°F) in July.
Over the past 30 days, the average sea temperature in Ishigaki has been 29.4°C.
Monthly Water Temperature Averages
Northern Hemisphere. Summer is generally June–August; winter is December–February.
| Month | Min | Average | Max |
|---|---|---|---|
| June | 28.0°C / 82.4°F | 28.8°C / 83.8°F | 29.8°C / 85.6°F |
| July | 27.6°C / 81.7°F | 29.9°C / 85.8°F | 31.1°C / 88.0°F |
| August | 28.0°C / 82.4°F | 29.7°C / 85.5°F | 31.2°C / 88.2°F |
| September | 28.8°C / 83.8°F | 29.3°C / 84.7°F | 29.7°C / 85.5°F |
Profile calculated from 2330 hourly forecast records across 4 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Ishigaki
Yaeyama island with manta rays at Kabira and clear subtropical reefs.
- Area
- Okinawa
Ishigaki Water Temperature: Common Questions
What is the sea temperature in Ishigaki today?
The current sea surface temperature in Ishigaki is 29.5°C. Over the last 30 days, the average has been 29.4°C.
When is the water warmest in Ishigaki?
The warmest monthly average in the Ishigaki archive is July, at around 29.9°C (85.8°F).
When is the water coldest in Ishigaki?
The coldest monthly average in the archive is June, at around 28.8°C (83.8°F).
Can you swim in Ishigaki today?
At 29.5°C, the water is usually comfortable for swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Ishigaki.
View Snorkel Forecast →