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

61.0

°F

April 8, 23:01

Trend:

increasing

Yesterday:

59.7°F

Tomorrow:

61.5°F

Sunrise:

05:31

Sunset:

18:18

Day Length:

12 h. 47 min.

Hekinan in April

Minimum:

52.2°F

Average:

55.7°F

Maximum:

60.9°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 61.0°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 2.3°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a noticeable 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 is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 62.9°F on 2023, while the historical minimum was 55.9°F on 2025.

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 61.9°F, with minimum temperature starting at 61.4°F, while the maximum might reach 62.5°F.

Daily water temperature in Hekinan

Date Current Year

actual* / forecast**

last year 10 years average
Mar 25 55.4°F 53.6°F 55.8°F
Mar 26 55.5°F 55.1°F 56.2°F
Mar 27 54.2°F 56.3°F 56.5°F
Mar 28 56.2°F 56.3°F 56.6°F
Mar 29 56.6°F 55.9°F 56.6°F
Mar 30 57.4°F 56.0°F 56.9°F
Mar 31 58.6°F 56.1°F 57.2°F
Apr 1 59.5°F 56.1°F 57.6°F
Apr 2 60.5°F 56.1°F 57.7°F
Apr 3 58.4°F 57.1°F 57.5°F
Apr 4 58.4°F 56.0°F 57.5°F
Apr 5 57.6°F 55.7°F 57.7°F
Apr 6 58.9°F 55.7°F 58.0°F
Apr 7 59.7°F 56.4°F 58.3°F
Apr 8 61.0°F 55.9°F 58.8°F
Apr 9 61.5°F 57.8°F 59.2°F
Apr 10 61.4°F 58.1°F 59.1°F
Apr 11 61.4°F 58.2°F 59.1°F
Apr 12 61.9°F 59.4°F 59.7°F
Apr 13 62.1°F 59.4°F 59.8°F
Apr 14 62.4°F 59.4°F 60.2°F
Apr 15 62.5°F 60.2°F 60.2°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 58.4°F 21mi
Tsu 56.5°F 28mi
Hamamatsu 58.9°F 44mi

* current water temperature in this city

** straight line distance from Hekinan