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

81.6

°F

September 14, 21:03

Trend:

stable

Yesterday:

80.9°F

Tomorrow:

81.2°F

Sunrise:

06:00

Sunset:

18:26

Day Length:

12 h. 26 min.

Kumamoto in September

Minimum:

52.2°F

Average:

57.6°F

Maximum:

60.5°F

Sea water temperature in Kumamoto today

As of now, in Kumamoto, the water temperature is 81.6°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is about the same as 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 fall a bit.

Recent sea temperature and forecast

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 85.8°F on 2024, while the historical minimum was 79.3°F on 2016.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the histoorical minimum and others when it was close to the historical maximum. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 80.7°F, the minimum temperature may reach 79.9°F, and the maximum might stay at 81.2°F.

Daily water temperature in Kumamoto

Date Current Year

actual* / forecast**

last year 10 years average
Aug 31 86.7°F 85.6°F 83.9°F
Sep 1 86.8°F 85.8°F 83.8°F
Sep 2 86.2°F 87.9°F 83.6°F
Sep 3 86.4°F 86.5°F 83.3°F
Sep 4 85.8°F 85.9°F 83.0°F
Sep 5 84.8°F 85.5°F 82.7°F
Sep 6 84.0°F 85.4°F 82.6°F
Sep 7 83.4°F 85.0°F 82.2°F
Sep 8 82.5°F 85.6°F 81.7°F
Sep 9 82.1°F 85.3°F 81.6°F
Sep 10 82.0°F 84.4°F 81.6°F
Sep 11 80.7°F 83.8°F 81.6°F
Sep 12 80.8°F 83.4°F 81.9°F
Sep 13 80.9°F 83.0°F 81.8°F
Sep 14 81.6°F 82.6°F 81.8°F
Sep 15 81.2°F 82.8°F 81.4°F
Sep 16 81.2°F 83.5°F 81.4°F
Sep 17 81.1°F 85.9°F 81.2°F
Sep 18 80.9°F 85.2°F 81.1°F
Sep 19 80.6°F 84.5°F 80.8°F
Sep 20 80.2°F 83.9°F 80.4°F
Sep 21 79.9°F 83.2°F 80.1°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 131 swimming days.
The warmest water in Kumamoto was recorded on July 29, 2026, reaching a 90.0°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, 62.1°F in Spring, 79.6°F in Summer, and 74.8°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Nagasaki 80.7°F 47mi
Beppu 79.6°F 57mi
Fukuoka 80.1°F 57mi
Ōita 79.5°F 60mi

* current water temperature in this city

** straight line distance from Kumamoto