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

73.2

°F

June 18, 08:51

Trend:

increasing

Yesterday:

72.9°F

Tomorrow:

73.5°F

Sunrise:

04:38

Sunset:

19:08

Day Length:

14 h. 30 min.

Hekinan in June

Minimum:

53.4°F

Average:

55.6°F

Maximum:

60.9°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 73.2°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 0.5°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 also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 77.7°F on 2024, while the historical minimum was 69.7°F on 2017.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 74.0°F, with minimum temperature starting at 73.5°F, while the maximum might reach 74.4°F.

Daily water temperature in Hekinan

Date Current Year

actual* / forecast**

last year 10 years average
Jun 4 72.1°F 69.2°F 70.6°F
Jun 5 71.4°F 69.2°F 70.8°F
Jun 6 70.7°F 70.5°F 70.8°F
Jun 7 71.4°F 70.4°F 71.1°F
Jun 8 71.3°F 70.5°F 71.5°F
Jun 9 70.9°F 70.4°F 71.5°F
Jun 10 70.3°F 70.3°F 71.5°F
Jun 11 70.9°F 70.3°F 71.9°F
Jun 12 71.2°F 71.0°F 72.3°F
Jun 13 72.7°F 71.0°F 72.3°F
Jun 14 73.2°F 71.2°F 72.5°F
Jun 15 72.3°F 71.2°F 72.7°F
Jun 16 73.4°F 73.6°F 73.4°F
Jun 17 72.9°F 73.8°F 73.5°F
Jun 18 73.2°F 75.3°F 73.7°F
Jun 19 73.5°F 77.0°F 74.0°F
Jun 20 73.8°F 78.9°F 74.4°F
Jun 21 73.9°F 80.0°F 74.4°F
Jun 22 73.9°F 79.6°F 74.4°F
Jun 23 74.0°F 79.3°F 74.5°F
Jun 24 74.3°F 79.0°F 74.9°F
Jun 25 74.4°F 78.7°F 74.9°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, 79.2°F in Summer, and 74.0°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Nagoya 73.1°F 21mi
Tsu 72.7°F 28mi
Hamamatsu 70.5°F 44mi

* current water temperature in this city

** straight line distance from Hekinan