All data are in degrees Fahrenheit

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Water temperature in Kumamoto

Detailed information about the current water temperature in Kumamoto. 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 Kumamoto now

57.9

°F

April 1, 11:09

Trend:

increasing

Yesterday:

57.7°F

Tomorrow:

58.1°F

Sunrise:

06:06

Sunset:

18:37

Day Length:

12 h. 31 min.

Kumamoto in April

Minimum:

55.5°F

Average:

58.2°F

Maximum:

61.6°F

Sea water temperature in Kumamoto today

As of now, in Kumamoto, the water temperature is 57.9°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 1.5°F lower 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

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 61.7°F on 2023, while the historical minimum was 57.8°F on 2025.

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 58.2°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Kumamoto

Date Current Year

actual* / forecast**

last year 10 years average
Mar 18 56.4°F 54.8°F 56.9°F
Mar 19 56.6°F 55.0°F 57.3°F
Mar 20 57.1°F 54.3°F 57.3°F
Mar 21 56.9°F 53.6°F 57.5°F
Mar 22 56.9°F 53.1°F 57.4°F
Mar 23 57.5°F 54.0°F 57.7°F
Mar 24 57.9°F 54.4°F 57.6°F
Mar 25 58.4°F 54.5°F 57.5°F
Mar 26 57.5°F 54.8°F 57.8°F
Mar 27 57.8°F 55.6°F 58.2°F
Mar 28 58.8°F 56.2°F 58.4°F
Mar 29 59.2°F 57.7°F 58.5°F
Mar 30 57.8°F 57.9°F 58.5°F
Mar 31 57.7°F 57.5°F 59.2°F
Apr 1 57.9°F 57.8°F 59.3°F
Apr 2 58.1°F 58.0°F 59.6°F
Apr 3 58.0°F 55.8°F 59.5°F
Apr 4 58.0°F 54.6°F 59.5°F
Apr 5 58.1°F 55.1°F 59.6°F
Apr 6 58.4°F 56.7°F 59.8°F
Apr 7 58.4°F 58.8°F 59.8°F
Apr 8 58.6°F 59.7°F 60.0°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 Kumamoto by month

In Kumamoto, the months June through October offer comfortable swimming conditions, which amounts to 130 swimming days.
The warmest water in Kumamoto was recorded on August 2, 2024, reaching a 89.5°F. While the coldest temperature occurred on February 24, 2018, dipping to 49.7°F. The average readings by season are 57.7°F in Winter, 62.0°F in Spring, 79.4°F in Summer, and 74.8°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Nagasaki 61.0°F 47mi
Beppu 57.8°F 57mi
Fukuoka 59.1°F 57mi
Ōita 57.2°F 60mi

* current water temperature in this city

** straight line distance from Kumamoto