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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

84.1

°F

July 24, 05:33

Trend:

increasing

Yesterday:

83.8°F

Tomorrow:

84.3°F

Sunrise:

05:22

Sunset:

19:24

Day Length:

14 h. 2 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 84.1°F. Swimming in water of this temperature is considered highly warm and would be enjoyable for everyone. At this temperature, you can comfortably engage in water-based activities for extended periods without experiencing discomfort. Today's reading is 3.6°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 notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 83.2°F on 2024, while the historical minimum was 76.4°F on 2019.

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 84.8°F, with minimum temperature starting at 84.3°F, while the maximum might reach 85.4°F.

Daily water temperature in Shimonoseki

Date Current Year

actual* / forecast**

 last year 10 years average
Jul 10 78.2°F 82.4°F 77.7°F
Jul 11 77.6°F 82.4°F 77.7°F
Jul 12 78.8°F 82.8°F 78.0°F
Jul 13 80.3°F 82.3°F 78.4°F
Jul 14 80.7°F 83.2°F 79.0°F
Jul 15 81.2°F 81.8°F 79.2°F
Jul 16 79.3°F 80.5°F 79.1°F
Jul 17 80.6°F 80.4°F 79.3°F
Jul 18 81.4°F 81.8°F 79.5°F
Jul 19 81.3°F 80.6°F 79.4°F
Jul 20 81.9°F 81.5°F 80.2°F
Jul 21 82.5°F 81.2°F 80.3°F
Jul 22 83.4°F 80.9°F 80.2°F
Jul 23 83.8°F 80.6°F 80.2°F
Jul 24 84.1°F 81.0°F 80.5°F
Jul 25 84.3°F 81.8°F 80.7°F
Jul 26 84.3°F 81.1°F 80.7°F
Jul 27 84.6°F 80.6°F 81.0°F
Jul 28 84.8°F 81.6°F 81.2°F
Jul 29 85.4°F 81.5°F 81.8°F
Jul 30 85.1°F 81.1°F 81.5°F
Jul 31 85.3°F 81.2°F 81.7°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, 59.5°F in Spring, 77.8°F in Summer, and 73.6°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Kitakyushu 84.7°F 9mi
Fukuoka 85.1°F 39mi
Beppu 85.2°F 57mi
Ōita 82.8°F 63mi

* current water temperature in this city

** straight line distance from Shimonoseki