What is the current water temperature in Shimonoseki?

Q: What is the current water temperature in Shimonoseki?

As of now, in Shimonoseki, the water temperature is 12.28°C. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration.

Japan > Shimonoseki

Water temperature in Shimonoseki

Detailed information about the current water temperature in Shimonoseki. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.

54.1

°F

January 30, 03:22

Trend:

decreasing

Yesterday:

54.2°F

Tomorrow:

53.7°F

Sunrise:

07:15

Sunset:

17:44

Day Length:

10 h. 29 min.

Shimonoseki in February

Minimum:

56.4°F

Average:

58.1°F

Maximum:

59.7°F

Sea water temperature in Shimonoseki today

As of now, in Shimonoseki, the water temperature is 54.1°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 1.4°F lower than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to fall a bit.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 56.9°F on 2016, while the historical minimum was 54.2°F on 2019.

latest data

last year

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 53.5°F, the minimum temperature may reach 53.4°F, and the maximum might stay at 53.7°F.

Daily water temperature in Shimonoseki

Date	Current Year actual* / forecast**	last year	10 years average
Jan 16	56.0°F	56.6°F	56.6°F
Jan 17	56.4°F	56.8°F	56.6°F
Jan 18	57.0°F	55.1°F	56.5°F
Jan 19	55.9°F	54.2°F	56.2°F
Jan 20	56.1°F	53.8°F	56.3°F
Jan 21	56.3°F	54.9°F	56.1°F
Jan 22	57.2°F	54.0°F	56.0°F
Jan 23	56.9°F	54.6°F	56.2°F
Jan 24	56.6°F	54.8°F	56.3°F
Jan 25	56.0°F	54.5°F	55.9°F
Jan 26	55.6°F	55.2°F	56.0°F
Jan 27	55.5°F	55.2°F	55.9°F
Jan 28	54.8°F	55.3°F	55.7°F
Jan 29	54.2°F	55.4°F	55.7°F
Jan 30	54.1°F	55.5°F	55.5°F
Jan 31	53.7°F	54.3°F	55.1°F
Feb 1	53.6°F	54.2°F	55.1°F
Feb 2	53.4°F	54.2°F	54.9°F
Feb 3	53.6°F	54.5°F	55.0°F
Feb 4	53.4°F	54.6°F	54.8°F
Feb 5	53.5°F	54.8°F	55.0°F
Feb 6	53.5°F	54.7°F	55.0°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Shimonoseki by month

In Shimonoseki, the months July through October offer comfortable swimming conditions, which amounts to 116 swimming days.

The warmest water in Shimonoseki was recorded on September 2, 2025, reaching a 86.9°F. While the coldest temperature occurred on March 10, 2025, dipping to 48.5°F. The average readings by season are 57.3°F in Winter, 59.3°F in Spring, 77.7°F in Summer, and 73.6°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Kitakyushu	53.7°F	9mi
Fukuoka	54.4°F	39mi
Beppu	56.0°F	57mi
Ōita	56.3°F	63mi

* current water temperature in this city

** straight line distance from Shimonoseki