INSTRUMENT / SEA TEMPERATURE
Ishigaki Water Temperature
Updated Sat 14:57 (Asia/Tokyo)
Japan · Forecast updated Nov 7, 2026, 14:57 UTC
Current Sea Temperature
26.9°C
80.4°F
Warm water
Valid Nov 7, 2026, 14:57 (Asia/Tokyo). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.3°C above
The typical November average is 26.6°C (79.9°F) from the historical baseline.
Recent trend
Cooling by 0.3°C
Seven-day average: 27.3°C, versus 27.6°C in the prior seven days.
What to wear
Warm water
Most people are comfortable in swimwear or a light rash guard.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions or replace the snorkel forecast.
Typical Sea Temperature Over the Year
In the historical baseline for Ishigaki, typical monthly averages range from about 22.9°C (73.2°F) in February to 30.2°C (86.4°F) in August.
Over the past 30 days, the average sea temperature in Ishigaki has been 27.9°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Ishigaki, calculated from hourly observations for 2022–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 22.5–23.5°C | 23.0°C / 73.4°F |
| February | 22.3–23.4°C | 22.9°C / 73.2°F |
| March | 23.2–23.4°C | 23.2°C / 73.8°F |
| April | 24.3–26.5°C | 25.1°C / 77.2°F |
| May | 26.1–27.5°C | 26.8°C / 80.2°F |
| June | 27.9–29.1°C | 28.6°C / 83.5°F |
| July | 29.5–30.8°C | 30.0°C / 86.0°F |
| August | 30.0–30.6°C | 30.2°C / 86.4°F |
| September | 29.6–30.4°C | 30.2°C / 86.4°F |
| October | 28.2–29.3°C | 28.8°C / 83.8°F |
| November | 26.5–26.7°C | 26.6°C / 79.9°F |
| December | 24.4–24.9°C | 24.5°C / 76.1°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (24.38, 124.13). Each month is the mean of yearly monthly means; the range is the lowest and highest of those yearly monthly means. Open-Meteo methodology.
Water temperature by month
Each month uses the 2022–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Ishigaki in January
Typical January water temperature near Ishigaki is 23.0°C (73.4°F), with yearly monthly means from 22.5–23.5°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: December 24.5°C · February 22.9°C.
Explore Ishigaki sea temperature in January, including swim comfort and month comparisons →
Ishigaki in February
Typical February water temperature near Ishigaki is 22.9°C (73.2°F), with yearly monthly means from 22.3–23.4°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: January 23.0°C · March 23.2°C.
Explore Ishigaki sea temperature in February, including swim comfort and month comparisons →
Ishigaki in March
Typical March water temperature near Ishigaki is 23.2°C (73.8°F), with yearly monthly means from 23.2–23.4°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: February 22.9°C · April 25.1°C.
Explore Ishigaki sea temperature in March, including swim comfort and month comparisons →
Ishigaki in April
Typical April water temperature near Ishigaki is 25.1°C (77.2°F), with yearly monthly means from 24.3–26.5°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: March 23.2°C · May 26.8°C.
Explore Ishigaki sea temperature in April, including swim comfort and month comparisons →
Ishigaki in May
Typical May water temperature near Ishigaki is 26.8°C (80.2°F), with yearly monthly means from 26.1–27.5°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: April 25.1°C · June 28.6°C.
Explore Ishigaki sea temperature in May, including swim comfort and month comparisons →
Ishigaki in June
Typical June water temperature near Ishigaki is 28.6°C (83.5°F), with yearly monthly means from 27.9–29.1°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: May 26.8°C · July 30.0°C.
Explore Ishigaki sea temperature in June, including swim comfort and month comparisons →
Ishigaki in July
Typical July water temperature near Ishigaki is 30.0°C (86.0°F), with yearly monthly means from 29.5–30.8°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: June 28.6°C · August 30.2°C.
Explore Ishigaki sea temperature in July, including swim comfort and month comparisons →
Ishigaki in August
Typical August water temperature near Ishigaki is 30.2°C (86.4°F), with yearly monthly means from 30.0–30.6°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: July 30.0°C · September 30.2°C.
Explore Ishigaki sea temperature in August, including swim comfort and month comparisons →
Ishigaki in September
Typical September water temperature near Ishigaki is 30.2°C (86.4°F), with yearly monthly means from 29.6–30.4°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: August 30.2°C · October 28.8°C.
Explore Ishigaki sea temperature in September, including swim comfort and month comparisons →
Ishigaki in October
Typical October water temperature near Ishigaki is 28.8°C (83.8°F), with yearly monthly means from 28.2–29.3°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: September 30.2°C · November 26.6°C.
Explore Ishigaki sea temperature in October, including swim comfort and month comparisons →
Ishigaki in November
Typical November water temperature near Ishigaki is 26.6°C (79.9°F), with yearly monthly means from 26.5–26.7°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: October 28.8°C · December 24.5°C.
Explore Ishigaki sea temperature in November, including swim comfort and month comparisons →
Ishigaki in December
Typical December water temperature near Ishigaki is 24.5°C (76.1°F), with yearly monthly means from 24.4–24.9°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: November 26.6°C · January 23.0°C.
Explore Ishigaki sea temperature in December, including swim comfort and month comparisons →
Forecast archive (growing)
These values come from hourly forecasts SnorkelForecast has stored. They cover only months with records and do not replace the historical baseline.
| 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 | 28.6°C / 83.5°F | 29.2°C / 84.6°F | 29.8°C / 85.6°F |
| October | 26.9°C / 80.4°F | 28.4°C / 83.2°F | 30.0°C / 86.0°F |
| November | 26.3°C / 79.3°F | 27.1°C / 80.8°F | 27.6°C / 81.7°F |
Partial coverage: 6 calendar months with records. Profile calculated from 3839 hourly forecast records across 6 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 water temperature in Ishigaki today?
The current sea surface temperature near Ishigaki is 26.9°C (80.4°F). Over the last 30 days, the average has been 27.9°C.
When is the water warmest in Ishigaki?
The water is typically warmest in August, at around 30.2°C (86.4°F) in the 2022–2025 historical baseline.
When is the water coldest in Ishigaki?
The water is typically coldest in February, at around 22.9°C (73.2°F) in the same historical baseline.
Can you swim in Ishigaki today?
At 26.9°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 →