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

69.0

°F

November 7, 20:57

Trend:

decreasing

Yesterday:

69.4°F

Tomorrow:

68.7°F

Sunrise:

06:18

Sunset:

16:53

Day Length:

10 h. 35 min.

Hekinan in November

Minimum:

51.6°F

Average:

54.4°F

Maximum:

59.0°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 69.0°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 0.4°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 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 72.6°F on 2024, while the historical minimum was 67.1°F on 2015.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 67.9°F, the minimum temperature may reach 67.2°F, and the maximum might stay at 68.7°F.

Daily water temperature in Hekinan

Date Current Year

actual* / forecast**

last year 10 years average
Oct 24 71.7°F 76.4°F 71.9°F
Oct 25 71.3°F 75.6°F 71.7°F
Oct 26 71.0°F 74.9°F 71.2°F
Oct 27 72.4°F 74.1°F 71.2°F
Oct 28 71.1°F 73.6°F 71.0°F
Oct 29 71.1°F 73.2°F 70.9°F
Oct 30 70.1°F 73.4°F 70.7°F
Oct 31 69.8°F 73.3°F 70.3°F
Nov 1 70.1°F 72.9°F 70.2°F
Nov 2 68.4°F 72.4°F 70.0°F
Nov 3 68.5°F 72.6°F 69.7°F
Nov 4 69.4°F 71.4°F 69.4°F
Nov 5 69.2°F 71.0°F 69.2°F
Nov 6 69.4°F 72.8°F 69.2°F
Nov 7 69.0°F 72.6°F 69.3°F
Nov 8 68.7°F 72.7°F 69.0°F
Nov 9 68.2°F 72.2°F 68.6°F
Nov 10 67.8°F 71.9°F 68.2°F
Nov 11 68.0°F 72.0°F 68.3°F
Nov 12 67.7°F 71.8°F 68.1°F
Nov 13 67.4°F 71.5°F 67.8°F
Nov 14 67.2°F 71.2°F 67.5°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 73.8°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Nagoya 68.9°F 21mi
Tsu 67.1°F 28mi
Hamamatsu 69.7°F 44mi

* current water temperature in this city

** straight line distance from Hekinan