What is the current water temperature in Shimonoseki?

As of now, in Shimonoseki, the water temperature is 23.52°C. It's safe to say that the water is comfortably warm for various water-related activities.

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.

74.3

°F

June 29, 09:37

Trend:

increasing

Yesterday:

74.1°F

Tomorrow:

74.7°F

Sunrise:

05:08

Sunset:

19:31

Day Length:

14 h. 23 min.

Shimonoseki in July

Minimum:

55.6°F

Average:

57.8°F

Maximum:

59.0°F

Sea water temperature in Shimonoseki today

As of now, in Shimonoseki, the water temperature is 74.3°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is about the same as 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 notably higher than the average recorded over the past two weeks, indicating a significant warming 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 76.5°F on 2025, while the historical minimum was 72.5°F on 2019.

latest data

last year

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 histoorical minimum and others when it was close to the historical maximum. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 76.1°F, with minimum temperature starting at 74.7°F, while the maximum might reach 77.3°F.

Daily water temperature in Shimonoseki

Date	Current Year actual* / forecast**	last year	10 years average
Jun 15	72.5°F	69.6°F	71.6°F
Jun 16	72.3°F	69.8°F	71.7°F
Jun 17	73.1°F	69.1°F	71.8°F
Jun 18	72.4°F	69.7°F	71.9°F
Jun 19	73.2°F	71.2°F	72.4°F
Jun 20	73.8°F	70.4°F	72.5°F
Jun 21	73.7°F	71.0°F	72.6°F
Jun 22	73.4°F	74.7°F	73.1°F
Jun 23	73.2°F	74.6°F	73.2°F
Jun 24	73.3°F	74.6°F	73.4°F
Jun 25	73.0°F	74.5°F	73.4°F
Jun 26	73.6°F	75.7°F	73.8°F
Jun 27	73.0°F	75.9°F	74.0°F
Jun 28	74.1°F	75.4°F	74.0°F
Jun 29	74.3°F	76.5°F	74.2°F
Jun 30	74.7°F	77.3°F	74.6°F
Jul 1	75.4°F	78.6°F	75.3°F
Jul 2	75.7°F	79.3°F	75.6°F
Jul 3	76.2°F	79.7°F	76.1°F
Jul 4	76.7°F	80.8°F	76.6°F
Jul 5	76.9°F	80.9°F	76.8°F
Jul 6	77.3°F	81.8°F	77.2°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, 59.5°F in Spring, 77.7°F in Summer, and 73.6°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Kitakyushu	74.6°F	9mi
Fukuoka	73.3°F	39mi
Beppu	73.8°F	57mi
Ōita	73.1°F	63mi

* current water temperature in this city

** straight line distance from Shimonoseki