All data are in degrees Fahrenheit

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Water temperature in Hekinan

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

81.4

°F

August 6, 03:46

Trend:

stable

Yesterday:

81.2°F

Tomorrow:

81.2°F

Sunrise:

05:05

Sunset:

18:51

Day Length:

13 h. 46 min.

Hekinan in August

Minimum:

51.6°F

Average:

54.8°F

Maximum:

59.9°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 81.4°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 3.0°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 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 is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 87.8°F on 2025, while the historical minimum was 81.6°F on 2017.

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 80.9°F, the minimum temperature may reach 80.6°F, and the maximum might stay at 81.2°F.

Daily water temperature in Hekinan

Date Current Year

actual* / forecast**

last year 10 years average
Jul 23 87.7°F 84.5°F 82.9°F
Jul 24 85.3°F 85.7°F 82.8°F
Jul 25 86.4°F 86.3°F 83.1°F
Jul 26 84.9°F 85.6°F 82.8°F
Jul 27 84.1°F 86.1°F 82.9°F
Jul 28 82.6°F 85.9°F 82.9°F
Jul 29 82.7°F 86.2°F 83.1°F
Jul 30 84.6°F 84.4°F 82.8°F
Jul 31 83.7°F 85.2°F 82.7°F
Aug 1 83.2°F 85.3°F 83.1°F
Aug 2 83.5°F 85.5°F 83.4°F
Aug 3 83.9°F 86.2°F 83.9°F
Aug 4 83.2°F 87.2°F 83.9°F
Aug 5 81.2°F 87.5°F 84.2°F
Aug 6 81.4°F 87.8°F 84.4°F
Aug 7 81.2°F 88.2°F 84.2°F
Aug 8 81.2°F 86.8°F 84.3°F
Aug 9 80.9°F 86.5°F 83.9°F
Aug 10 80.7°F 86.2°F 83.7°F
Aug 11 80.6°F 86.2°F 83.6°F
Aug 12 80.8°F 84.6°F 83.8°F
Aug 13 81.0°F 84.4°F 84.0°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 Hekinan by month

In Hekinan, the months July through October offer comfortable swimming conditions, which amounts to 127 swimming days.
The warmest water in Hekinan was recorded on August 7, 2025, reaching a 88.2°F. While the coldest temperature occurred on February 16, 2018, dipping to 47.8°F. The average readings by season are 55.4°F in Winter, 60.6°F in Spring, 79.3°F in Summer, and 74.0°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Nagoya 82.5°F 21mi
Tsu 79.9°F 28mi
Hamamatsu 80.0°F 44mi

* current water temperature in this city

** straight line distance from Hekinan