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

51.9

°F

January 11, 23:22

Trend:

stable

Yesterday:

52.4°F

Tomorrow:

52.0°F

Sunrise:

07:00

Sunset:

17:00

Day Length:

10 h. 0 min.

Hekinan in January

Minimum:

54.1°F

Average:

56.6°F

Maximum:

61.5°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 51.9°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 2.0°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 stay about the same.

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 59.0°F on 2016, while the historical minimum was 51.6°F on 2025.

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 51.6°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
Jan 1 57.0°F 56.0°F 56.6°F
Jan 2 56.7°F 53.1°F 56.1°F
Jan 3 55.7°F 52.4°F 55.8°F
Jan 4 55.7°F 52.6°F 55.7°F
Jan 5 56.0°F 53.1°F 55.9°F
Jan 6 55.8°F 53.4°F 55.6°F
Jan 7 56.0°F 52.9°F 55.0°F
Jan 8 54.8°F 51.6°F 54.8°F
Jan 9 52.6°F 52.2°F 54.2°F
Jan 10 52.4°F 52.2°F 53.8°F
Jan 11 51.9°F 51.6°F 53.9°F
Jan 12 52.0°F 52.1°F 54.0°F
Jan 13 51.4°F 50.2°F 53.4°F
Jan 14 51.5°F 50.3°F 53.5°F
Jan 15 51.5°F 50.8°F 53.5°F
Jan 16 51.4°F 52.1°F 53.4°F
Jan 17 51.5°F 52.2°F 53.5°F
Jan 18 51.6°F 52.0°F 53.6°F
Dec 28 57.7°F 56.9°F 57.2°F
Dec 29 57.0°F 55.7°F 56.7°F
Dec 30 56.5°F 56.0°F 56.8°F
Dec 31 57.5°F 56.0°F 56.6°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 55.6°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 54.4°F 21mi
Tsu 51.0°F 28mi
Hamamatsu 57.2°F 44mi

* current water temperature in this city

** straight line distance from Hekinan