INSTRUMENT / SEA TEMPERATURE
Kerama Islands Water Temperature
Updated Fri 13:58 (Asia/Tokyo)
Japan · Forecast updated Nov 6, 2026, 13:58 UTC
Current Sea Temperature
26.7°C
80.1°F
Warm water
Valid Nov 6, 2026, 13:58 (Asia/Tokyo). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
Close to average
The typical November average is 26.5°C (79.7°F) from the historical baseline.
Recent trend
Cooling by 0.7°C
Seven-day average: 26.8°C, versus 27.5°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 Kerama Islands, typical monthly averages range from about 21.8°C (71.2°F) in March to 29.8°C (85.6°F) in September.
Over the past 30 days, the average sea temperature in Kerama Islands has been 27.7°C.
Historical baseline (full year)
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Kerama Islands, calculated from hourly observations for 2022–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 21.8–23.0°C | 22.3°C / 72.1°F |
| February | 21.2–22.6°C | 21.9°C / 71.4°F |
| March | 21.5–22.0°C | 21.8°C / 71.2°F |
| April | 22.2–23.4°C | 22.9°C / 73.2°F |
| May | 23.8–24.7°C | 24.4°C / 75.9°F |
| June | 26.3–27.9°C | 27.1°C / 80.8°F |
| July | 28.9–30.0°C | 29.3°C / 84.7°F |
| August | 28.4–30.5°C | 29.5°C / 85.1°F |
| September | 29.4–30.1°C | 29.8°C / 85.6°F |
| October | 27.8–29.5°C | 28.6°C / 83.5°F |
| November | 25.8–26.8°C | 26.5°C / 79.7°F |
| December | 24.1–24.3°C | 24.2°C / 75.6°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (26.21, 127.38). 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.
Kerama Islands in January
Typical January water temperature near Kerama Islands is 22.3°C (72.1°F), with yearly monthly means from 21.8–23.0°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: December 24.2°C · February 21.9°C.
Explore Kerama Islands sea temperature in January, including swim comfort and month comparisons →
Kerama Islands in February
Typical February water temperature near Kerama Islands is 21.9°C (71.4°F), with yearly monthly means from 21.2–22.6°C.
Swimming and snorkeling: cool water. A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Adjacent months: January 22.3°C · March 21.8°C.
Explore Kerama Islands sea temperature in February, including swim comfort and month comparisons →
Kerama Islands in March
Typical March water temperature near Kerama Islands is 21.8°C (71.2°F), with yearly monthly means from 21.5–22.0°C.
Swimming and snorkeling: cool water. A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.
Adjacent months: February 21.9°C · April 22.9°C.
Explore Kerama Islands sea temperature in March, including swim comfort and month comparisons →
Kerama Islands in April
Typical April water temperature near Kerama Islands is 22.9°C (73.2°F), with yearly monthly means from 22.2–23.4°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: March 21.8°C · May 24.4°C.
Explore Kerama Islands sea temperature in April, including swim comfort and month comparisons →
Kerama Islands in May
Typical May water temperature near Kerama Islands is 24.4°C (75.9°F), with yearly monthly means from 23.8–24.7°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: April 22.9°C · June 27.1°C.
Explore Kerama Islands sea temperature in May, including swim comfort and month comparisons →
Kerama Islands in June
Typical June water temperature near Kerama Islands is 27.1°C (80.8°F), with yearly monthly means from 26.3–27.9°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: May 24.4°C · July 29.3°C.
Explore Kerama Islands sea temperature in June, including swim comfort and month comparisons →
Kerama Islands in July
Typical July water temperature near Kerama Islands is 29.3°C (84.7°F), with yearly monthly means from 28.9–30.0°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: June 27.1°C · August 29.5°C.
Explore Kerama Islands sea temperature in July, including swim comfort and month comparisons →
Kerama Islands in August
Typical August water temperature near Kerama Islands is 29.5°C (85.1°F), with yearly monthly means from 28.4–30.5°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: July 29.3°C · September 29.8°C.
Explore Kerama Islands sea temperature in August, including swim comfort and month comparisons →
Kerama Islands in September
Typical September water temperature near Kerama Islands is 29.8°C (85.6°F), with yearly monthly means from 29.4–30.1°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: August 29.5°C · October 28.6°C.
Explore Kerama Islands sea temperature in September, including swim comfort and month comparisons →
Kerama Islands in October
Typical October water temperature near Kerama Islands is 28.6°C (83.5°F), with yearly monthly means from 27.8–29.5°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: September 29.8°C · November 26.5°C.
Explore Kerama Islands sea temperature in October, including swim comfort and month comparisons →
Kerama Islands in November
Typical November water temperature near Kerama Islands is 26.5°C (79.7°F), with yearly monthly means from 25.8–26.8°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: October 28.6°C · December 24.2°C.
Explore Kerama Islands sea temperature in November, including swim comfort and month comparisons →
Kerama Islands in December
Typical December water temperature near Kerama Islands is 24.2°C (75.6°F), with yearly monthly means from 24.1–24.3°C.
Swimming and snorkeling: mild water. A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
Adjacent months: November 26.5°C · January 22.3°C.
Explore Kerama Islands 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 | 24.9°C / 76.8°F | 25.9°C / 78.6°F | 27.5°C / 81.5°F |
| July | 26.5°C / 79.7°F | 28.3°C / 83.0°F | 30.8°C / 87.4°F |
| August | 26.7°C / 80.1°F | 28.6°C / 83.4°F | 31.1°C / 88.0°F |
| September | 28.3°C / 82.9°F | 29.0°C / 84.2°F | 29.7°C / 85.5°F |
| October | 26.9°C / 80.4°F | 28.1°C / 82.6°F | 29.3°C / 84.7°F |
| November | 26.4°C / 79.5°F | 26.7°C / 80.1°F | 27.1°C / 80.8°F |
Partial coverage: 6 calendar months with records. Profile calculated from 3814 hourly forecast records across 6 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Kerama Islands
Okinawan islands with 'Kerama blue' water, turtles and bright coral.
- Area
- Okinawa
Kerama Islands Water Temperature: Common Questions
What is the water temperature in Kerama Islands today?
The current sea surface temperature near Kerama Islands is 26.7°C (80.1°F). Over the last 30 days, the average has been 27.7°C.
When is the water warmest in Kerama Islands?
The water is typically warmest in September, at around 29.8°C (85.6°F) in the 2022–2025 historical baseline.
When is the water coldest in Kerama Islands?
The water is typically coldest in March, at around 21.8°C (71.2°F) in the same historical baseline.
Can you swim in Kerama Islands today?
At 26.7°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 Kerama Islands.
View Snorkel Forecast →