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 29.67°C. 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.

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.

85.4

°F

August 30, 04:20

Trend:

decreasing

Yesterday:

85.4°F

Tomorrow:

85.3°F

Sunrise:

05:48

Sunset:

18:46

Day Length:

12 h. 58 min.

Shimonoseki in September

Minimum:

53.9°F

Average:

57.6°F

Maximum:

59.3°F

Sea water temperature in Shimonoseki today

As of now, in Shimonoseki, the water temperature is 85.4°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 3.5°F higher 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 stay about the same.

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 is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 83.7°F on 2023, while the historical minimum was 77.6°F on 2015.

latest data

last year

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 shows a gradual cooling trend. The average temperature is expected to be 84.8°F, the minimum temperature may reach 84.4°F, and the maximum might stay at 85.3°F.

Daily water temperature in Shimonoseki

Date	Current Year actual* / forecast**	last year	10 years average
Aug 16	83.9°F	84.9°F	82.8°F
Aug 17	85.2°F	83.7°F	82.2°F
Aug 18	85.1°F	83.3°F	82.3°F
Aug 19	85.6°F	83.5°F	82.5°F
Aug 20	86.1°F	84.3°F	82.7°F
Aug 21	86.1°F	85.3°F	82.8°F
Aug 22	85.9°F	85.4°F	82.8°F
Aug 23	86.0°F	86.2°F	83.1°F
Aug 24	85.5°F	85.2°F	83.0°F
Aug 25	86.6°F	84.4°F	83.1°F
Aug 26	86.2°F	82.4°F	82.7°F
Aug 27	86.1°F	84.0°F	82.6°F
Aug 28	86.3°F	83.9°F	82.4°F
Aug 29	85.4°F	83.6°F	81.9°F
Aug 30	85.4°F	83.4°F	81.9°F
Aug 31	85.3°F	82.9°F	81.8°F
Sep 1	85.2°F	82.0°F	81.7°F
Sep 2	84.9°F	81.7°F	81.4°F
Sep 3	84.6°F	82.2°F	81.1°F
Sep 4	84.7°F	81.8°F	81.1°F
Sep 5	84.5°F	81.3°F	81.0°F
Sep 6	84.4°F	81.2°F	80.9°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 September offer comfortable swimming conditions, which amounts to 112 swimming days.

The warmest water in Shimonoseki was recorded on August 8, 2024, reaching a 86.8°F. While the coldest temperature occurred on March 10, 2025, dipping to 48.5°F. The average readings by season are 57.4°F in Winter, 59.3°F in Spring, 77.5°F in Summer, and 73.1°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Kitakyushu	86.1°F	9mi
Fukuoka	84.9°F	39mi
Beppu	84.1°F	57mi
Ōita	84.1°F	63mi

* current water temperature in this city

** straight line distance from Shimonoseki