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Sasebo

Water Temperature in the Seto Inland Sea in Sasebo, Japan: Current, Historical Data and Forecast

On this page, you will find comprehensive information about the sea temperature in Sasebo in Japan, including current readings, historical data and trends, monthly averages, as well as weather forecasts and upcoming temperature predictions. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Current Water Temperature in Sasebo

12.7°C

TODAY

12.5°C

YESTERDAY

12.3°C

A WEEK AGO

Analysis, Historical Data, and Forecast of Water Temperature

Today sea water temperature in the Seto Inland Sea in Sasebo is 12.7°C. The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear.

It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.

Water Temperature Chart for Seto Inland Sea in Sasebo Over the Last 30 Days

The water temperature in Sasebo today is lower than both a week ago and a month ago. Today's sea temperature is generally in line with historical values for this day.

According to our forecast, the sea temperature in Sasebo will rise slightly in the coming days and reach 14.4°C.

Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.

Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts across Japan to enhance accuracy.

Water temperature data for Sasebo and nearby towns and resorts is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.

Table of Daily Sea Temperature Data

Date	Current	Average	Forecast
Feb 15	12.3°C	15.0°C
Feb 16	12.3°C	15.3°C
Feb 17	12.4°C	15.0°C
Feb 18	12.2°C	15.3°C
Feb 19	12.5°C	15.5°C
Feb 20	12.7°C	15.5°C
Feb 21	12.5°C	15.0°C
Feb 22	12.7°C	15.8°C
Feb 23		15.8°C	13.0°C
Feb 24		15.8°C	13.3°C
Feb 25		15.3°C	13.5°C
Feb 26		15.8°C	13.7°C
Feb 27		15.0°C	13.8°C
Feb 28		15.8°C	14.0°C
Mar 1		15.8°C	14.2°C
Mar 2		15.8°C	14.4°C

* Current - Actual water temperature value

** Average - Average water temperature on this day in recent years

*** Forecast - Our water temperature forecast

Sea Temperature in Sasebo Throughout the Year

Throughout the year, the sea temperature in Sasebo exceeds 77°F (25°C) for 77 days, exceeds 72°F (22°C) for 141 days, and exceeds 64°F (18°C) for 213 days.

Below is the annual chart of sea temperature changes in the Seto Inland Sea in Sasebo.

January

Minimum	Average	Maximum
13°C	16°C	19°C

February

Minimum	Average	Maximum
12°C	14.5°C	17°C

March

Minimum	Average	Maximum
12°C	14.5°C	17°C

April

Minimum	Average	Maximum
14°C	16.5°C	19°C

May

Minimum	Average	Maximum
16°C	19.5°C	23°C

June

Minimum	Average	Maximum
19°C	22.5°C	26°C

July

Minimum	Average	Maximum
22°C	25°C	28°C

August

Minimum	Average	Maximum
25°C	27.5°C	30°C

September

Minimum	Average	Maximum
23°C	26.5°C	30°C

October

Minimum	Average	Maximum
21°C	24°C	27°C

November

Minimum	Average	Maximum
18°C	21°C	24°C

December

Minimum	Average	Maximum
15°C	18°C	21°C

Monthly Water Temperature Histogram for Seto Inland Sea in Sasebo

You can explore detailed data on how the water temperature in Sasebo varies each month:

What Beaches Are There In and Around Sasebo?

Shirahama Beach

Shirahama Beach is a 3-stars sandy beach, located in a 7 km (4 miles) radius of Sasebo. There is parking. Shirahama Beach is an excellent spot for fishing enthusiasts, offering good opportunities to catch local fish. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.

Link to the location of the beach

Shirahama Beach Resort

Shirahama Beach Resort is a 3-stars sandy beach, located in a 7 km (4 miles) radius of Sasebo. There is parking. There are restrooms. The calm waters make this beach ideal for swimming, providing a safe and enjoyable experience for all visitors.

Link to the location of the beach

Sasebo Weather

FEBRUARY 23

-0°C / 6°C

overcast clouds: 85-100%

humidity: 59% | wind: 4 km/h

FEBRUARY 24

0°C / 10°C

clear sky

humidity: 68% | wind: 2 km/h

FEBRUARY 25

5°C / 12°C

broken clouds: 51-84%

humidity: 66% | wind: 2 km/h

FEBRUARY 26

4°C / 10°C

overcast clouds: 85-100%

humidity: 70% | wind: 1 km/h

Sea Temperature in the Seto Inland Sea in Sasebo: General Trends and Swimming Opportunities

Original name

佐世保市

The Local Time

02:20

Time Zone

UTC+9

Sunrise

06:57

Sunset

18:11

Length of the day

11 h 13 m

Nagasaki Prefecture, Japan, enjoys a humid subtropical climate, characterized by mild winters and long, hot, and humid summers. Despite high precipitation throughout the year, it sees slightly heavier rainfall from June to September during the rainy season and typhoons.

Sasebo is located in Asia in the Northern Hemisphere at a latitude of 33 degrees, along the shores of the Seto Inland Sea. Sasebo lies within the Nagasaki Prefecture in Japan.

The average annual daytime air temperature in Sasebo is 21°C (70°F), with the average nighttime temperature being 13°C (55°F). The highest average daily temperature occurs in August, reaching 32°C (89°F), while the lowest is in January at 10°C (49°F). As for nighttime temperatures, the minimum average temperature of 3°C (38°F) is recorded in January, and the maximum is in August, reaching 24°C (76°F).

According to historical data, Sasebo experiences 133 rainy days per year, which accounts for 36 percent of all days in the year. On average, there are 11 rainy days each month. The wettest month is July, with 15 rainy days and 287 mm (11.3 inches) of precipitation, while the driest month is October, which typically has 8 rainy days and only 85 mm (3.3 inches) of precipitation.

The average annual water temperature in Seto Inland Sea in Sasebo is 20°C (68°F). In February, the water reaches its lowest point of the year at 12°C (54°F), while in August, it peaks at 30°C (86°F). The months suitable for comfortable beach vacations and swimming in the Seto Inland Sea are July, August, September, and October. During this period, the water temperature stays above 20°C (68°F) and can reach up to 30°C (86°F) on some days.

Geographical Location of Sasebo

Nearby Cities

Frequently Asked Questions About Sasebo and its Water Temperatures

What is the current sea temperature in Sasebo?

The water temperature today in the Seto Inland Sea in Sasebo is 55°F (12.7°C).

In which months is the water temperature in Sasebo comfortable for swimming?

The water temperature in the Seto Inland Sea in Sasebo is comfortable for swimming and beach vacations in July, August, September, and October.

What is the water temperature in Sasebo during the winter?

The water temperature in the Seto Inland Sea in Sasebo during the winter ranges from 12°C to 21°C (54°F to 70°F).

What is the water temperature in Sasebo during the spring?

The water temperature in the Seto Inland Sea in Sasebo during the spring ranges from 12°C to 23°C (54°F to 73°F).

What is the water temperature in Sasebo during the summer?

The water temperature in the Seto Inland Sea in Sasebo during the summer ranges from 19°C to 30°C (66°F to 86°F).

What is the water temperature in Sasebo during the fall?

The water temperature in the Seto Inland Sea in Sasebo during the fall ranges from 18°C to 30°C (64°F to 86°F).

Is it possible to swim in the sea in Sasebo year-round?

No, it is not possible to swim in the Seto Inland Sea in Sasebo year-round, the months suitable for comfortable swimming are July, August, September, and October.

What sea temperatures can I expect in Sasebo in the next month?

In March, the water temperature in the Seto Inland Sea in Sasebo will range between 54°F (12°C) and 63°F (17°C)