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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.
Sea temperature in Shimonoseki now

54.1

°F

March 12, 18:47

Trend:

increasing

Yesterday:

53.9°F

Tomorrow:

54.5°F

Sunrise:

06:32

Sunset:

18:21

Day Length:

11 h. 49 min.

Shimonoseki in March

Minimum:

56.4°F

Average:

58.1°F

Maximum:

59.6°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 0.4°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to rise a bit.

Recent sea temperature and forecast

Today's water temperature is slightly lower than the average registered over the last two weeks, indicating a slight cooling trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 56.3°F on 2023, while the historical minimum was 49.6°F on 2025.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 54.9°F, with minimum temperature starting at 54.5°F, while the maximum might reach 55.4°F.

Daily water temperature in Shimonoseki

Date Current Year

actual* / forecast**

 last year 10 years average
Feb 26 55.2°F 52.1°F 53.6°F
Feb 27 55.0°F 51.6°F 53.6°F
Feb 28 54.7°F 51.8°F 53.6°F
Mar 1 53.5°F 52.2°F 53.5°F
Mar 2 53.7°F 52.3°F 53.7°F
Mar 3 53.9°F 52.8°F 53.8°F
Mar 4 55.0°F 52.9°F 54.1°F
Mar 5 54.4°F 53.0°F 53.9°F
Mar 6 53.5°F 53.1°F 53.9°F
Mar 7 54.1°F 52.8°F 53.8°F
Mar 8 54.2°F 52.9°F 53.5°F
Mar 9 54.4°F 49.4°F 53.2°F
Mar 10 54.2°F 48.5°F 53.3°F
Mar 11 53.9°F 49.5°F 53.5°F
Mar 12 54.1°F 49.6°F 53.7°F
Mar 13 54.5°F 51.5°F 54.2°F
Mar 14 54.6°F 51.9°F 54.3°F
Mar 15 54.5°F 52.3°F 54.1°F
Mar 16 54.8°F 52.7°F 54.5°F
Mar 17 55.0°F 52.9°F 54.6°F
Mar 18 55.2°F 53.3°F 54.8°F
Mar 19 55.4°F 53.7°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

January

February

March

April

May

June

July

August

September

October

November

December

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, 59.4°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 55.1°F 39mi
Beppu 58.8°F 57mi
Ōita 57.6°F 63mi

* current water temperature in this city

** straight line distance from Shimonoseki