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 21.27°C. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool.

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.

70.3

°F

June 8, 12:24

Trend:

stable

Yesterday:

70.3°F

Tomorrow:

70.5°F

Sunrise:

05:05

Sunset:

19:26

Day Length:

14 h. 21 min.

Shimonoseki in June

Minimum:

56.3°F

Average:

57.9°F

Maximum:

59.8°F

Sea water temperature in Shimonoseki today

As of now, in Shimonoseki, the water temperature is 70.3°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 0.6°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 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 is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 70.7°F on 2022, while the historical minimum was 68.1°F on 2025.

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 suggests a gradual increase. The average temperature is expected to rise up to 71.4°F, with minimum temperature starting at 70.5°F, while the maximum might reach 72.1°F.

Daily water temperature in Shimonoseki

Date	Current Year actual* / forecast**	last year	10 years average
May 25	69.3°F	65.9°F	67.4°F
May 26	68.4°F	65.7°F	67.6°F
May 27	68.7°F	63.5°F	67.4°F
May 28	69.1°F	66.3°F	67.9°F
May 29	70.7°F	66.3°F	67.9°F
May 30	70.4°F	66.5°F	67.9°F
May 31	70.3°F	66.4°F	68.4°F
Jun 1	71.3°F	66.6°F	68.7°F
Jun 2	71.0°F	67.1°F	68.5°F
Jun 3	72.8°F	67.3°F	69.5°F
Jun 4	72.6°F	67.2°F	69.6°F
Jun 5	72.4°F	66.4°F	69.6°F
Jun 6	70.2°F	68.2°F	69.7°F
Jun 7	70.3°F	67.9°F	69.7°F
Jun 8	70.3°F	68.1°F	69.7°F
Jun 9	70.5°F	68.4°F	69.9°F
Jun 10	70.9°F	68.5°F	70.3°F
Jun 11	71.3°F	68.7°F	70.8°F
Jun 12	71.5°F	68.9°F	70.9°F
Jun 13	71.7°F	69.2°F	71.2°F
Jun 14	71.9°F	69.4°F	71.3°F
Jun 15	72.1°F	69.6°F	71.5°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	70.9°F	9mi
Fukuoka	72.4°F	39mi
Beppu	71.4°F	57mi
Ōita	71.0°F	63mi

* current water temperature in this city

** straight line distance from Shimonoseki