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

54.4

°F

March 4, 02:46

Trend:

increasing

Yesterday:

54.4°F

Tomorrow:

54.8°F

Sunrise:

06:19

Sunset:

17:50

Day Length:

11 h. 31 min.

Hekinan in March

Minimum:

52.4°F

Average:

55.8°F

Maximum:

61.1°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 54.4°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 1.0°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 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 60.7°F on 2016, while the historical minimum was 49.9°F on 2018.

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 54.7°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Hekinan

Date Current Year

actual* / forecast**

last year 10 years average
Feb 18 50.8°F 52.5°F 52.4°F
Feb 19 49.7°F 52.9°F 52.6°F
Feb 20 49.8°F 53.1°F 52.7°F
Feb 21 49.3°F 53.5°F 52.7°F
Feb 22 48.4°F 53.6°F 52.8°F
Feb 23 52.1°F 53.5°F 53.4°F
Feb 24 52.1°F 53.5°F 53.2°F
Feb 25 52.5°F 53.3°F 53.3°F
Feb 26 53.0°F 53.2°F 53.3°F
Feb 27 52.8°F 53.7°F 53.5°F
Feb 28 53.0°F 54.0°F 53.5°F
Mar 1 53.5°F 53.3°F 53.5°F
Mar 2 53.4°F 52.7°F 53.5°F
Mar 3 54.4°F 52.8°F 53.4°F
Mar 4 54.4°F 53.0°F 53.4°F
Mar 5 54.8°F 53.4°F 53.8°F
Mar 6 55.0°F 52.8°F 54.0°F
Mar 7 54.7°F 52.6°F 53.7°F
Mar 8 54.5°F 50.9°F 53.5°F
Mar 9 54.5°F 51.2°F 53.5°F
Mar 10 54.7°F 50.8°F 53.7°F
Mar 11 55.0°F 51.3°F 54.0°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, 60.5°F in Spring, 79.2°F in Summer, and 74.0°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Nagoya 53.5°F 21mi
Tsu 52.1°F 28mi
Hamamatsu 59.1°F 44mi

* current water temperature in this city

** straight line distance from Hekinan