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 17.27°C. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it.

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.

63.1

°F

May 9, 22:16

Trend:

increasing

Yesterday:

62.8°F

Tomorrow:

63.3°F

Sunrise:

05:20

Sunset:

19:05

Day Length:

13 h. 45 min.

Shimonoseki in May

Minimum:

55.9°F

Average:

57.9°F

Maximum:

60.0°F

Sea water temperature in Shimonoseki today

As of now, in Shimonoseki, the water temperature is 63.1°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 0.6°F lower 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 minimum temperature for this date. The maximum temperature recorded for this date was 64.8°F on 2023, while the historical minimum was 62.6°F on 2018.

latest data

last year

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 63.4°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Shimonoseki

Date	Current Year actual* / forecast**	last year	10 years average
Apr 25	61.8°F	61.4°F	60.5°F
Apr 26	59.9°F	59.8°F	60.4°F
Apr 27	60.5°F	60.1°F	60.5°F
Apr 28	60.8°F	62.1°F	60.8°F
Apr 29	60.3°F	62.3°F	61.1°F
Apr 30	61.1°F	62.3°F	61.2°F
May 1	61.6°F	62.3°F	61.5°F
May 2	62.7°F	62.5°F	62.1°F
May 3	61.7°F	64.0°F	62.0°F
May 4	61.8°F	64.3°F	62.1°F
May 5	62.3°F	63.9°F	62.7°F
May 6	62.4°F	64.1°F	62.9°F
May 7	61.9°F	63.8°F	63.0°F
May 8	62.8°F	64.0°F	63.7°F
May 9	63.1°F	63.3°F	63.7°F
May 10	63.3°F	63.8°F	63.9°F
May 11	62.8°F	63.3°F	63.4°F
May 12	63.1°F	63.6°F	63.7°F
May 13	63.2°F	63.8°F	63.8°F
May 14	63.5°F	64.0°F	64.1°F
May 15	63.6°F	65.1°F	64.2°F
May 16	64.1°F	64.9°F	64.7°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

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, 77.4°F in Summer, and 73.1°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Kitakyushu	63.0°F	9mi
Fukuoka	63.1°F	39mi
Beppu	60.7°F	57mi
Ōita	60.0°F	63mi

* current water temperature in this city

** straight line distance from Shimonoseki