What is the current water temperature in Hekinan?

Q: What is the current water temperature in Hekinan?

As of now, in Hekinan, the water temperature is 13.38°C. 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.

Japan > Hekinan

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.

56.1

°F

December 16, 15:22

Trend:

decreasing

Yesterday:

56.3°F

Tomorrow:

55.7°F

Sunrise:

06:53

Sunset:

16:42

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 56.1°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 3.5°F lower 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 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 62.2°F on 2015, while the historical minimum was 58.6°F on 2018.

latest data

last year

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. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 55.1°F, the minimum temperature may reach 54.6°F, and the maximum might stay at 55.7°F.

Daily water temperature in Hekinan

Date	Current Year actual* / forecast**	last year	10 years average
Dec 2	61.5°F	62.5°F	62.9°F
Dec 3	61.7°F	62.3°F	62.7°F
Dec 4	61.4°F	63.0°F	62.5°F
Dec 5	61.6°F	63.3°F	62.4°F
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	59.8°F
Dec 16	56.1°F	58.7°F	59.6°F
Dec 17	55.7°F	58.0°F	59.2°F
Dec 18	55.7°F	58.2°F	59.2°F
Dec 19	55.2°F	56.3°F	58.7°F
Dec 20	54.8°F	56.5°F	58.3°F
Dec 21	54.6°F	57.1°F	58.1°F
Dec 22	54.9°F	57.6°F	58.4°F
Dec 23	54.9°F	57.8°F	58.4°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	57.6°F	21mi
Tsu	56.9°F	28mi
Hamamatsu	62.4°F	44mi

* current water temperature in this city

** straight line distance from Hekinan