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

57.9

°F

December 20, 19:43

Trend:

stable

Yesterday:

57.8°F

Tomorrow:

57.8°F

Sunrise:

06:55

Sunset:

16:44

Day Length:

9 h. 49 min.

Hekinan in December

Minimum:

52.1°F

Average:

54.4°F

Maximum:

58.8°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 57.9°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 0.3°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 slightly lower than the average registered over the last two weeks, indicating a slight cooling 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 60.4°F on 2015, while the historical minimum was 56.5°F on 2024.

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest values recorded on those days in the past. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 57.8°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
Dec 6 60.5°F 62.9°F 62.1°F
Dec 7 60.1°F 62.0°F 61.9°F
Dec 8 59.5°F 61.7°F 61.2°F
Dec 9 59.2°F 61.5°F 60.9°F
Dec 10 59.0°F 61.3°F 60.6°F
Dec 11 58.8°F 61.3°F 60.7°F
Dec 12 58.8°F 59.5°F 60.4°F
Dec 13 58.4°F 59.4°F 60.0°F
Dec 14 58.3°F 58.9°F 59.7°F
Dec 15 56.3°F 59.2°F 59.5°F
Dec 16 57.1°F 58.7°F 59.4°F
Dec 17 57.1°F 58.0°F 59.0°F
Dec 18 57.2°F 58.2°F 59.0°F
Dec 19 57.8°F 56.3°F 58.6°F
Dec 20 57.9°F 56.5°F 58.3°F
Dec 21 57.8°F 57.1°F 58.1°F
Dec 22 58.0°F 57.6°F 58.4°F
Dec 23 58.0°F 57.8°F 58.4°F
Dec 24 57.9°F 57.7°F 58.2°F
Dec 25 57.9°F 58.3°F 58.2°F
Dec 26 57.9°F 58.6°F 58.3°F
Dec 27 57.4°F 57.5°F 57.8°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 124 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 56.0°F in Winter, 60.6°F in Spring, 78.9°F in Summer, and 73.7°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Nagoya 57.5°F 21mi
Tsu 56.0°F 28mi
Hamamatsu 63.6°F 44mi

* current water temperature in this city

** straight line distance from Hekinan