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

69.8

°F

November 11, 14:16

Trend:

stable

Yesterday:

69.7°F

Tomorrow:

69.5°F

Sunrise:

06:22

Sunset:

16:50

Day Length:

10 h. 28 min.

Hekinan in November

Minimum:

51.6°F

Average:

53.7°F

Maximum:

59.0°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 69.8°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 1.4°F higher 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 maximum temperature for this date. The maximum temperature recorded for this date was 70.3°F on 2022, while the historical minimum was 67.6°F on 2020.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the maximum recorded over the past years. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 69.0°F, the minimum temperature may reach 68.7°F, and the maximum might stay at 69.5°F.

Daily water temperature in Hekinan

Date Current Year

actual* / forecast**

last year 10 years average
Oct 28 73.7°F 71.1°F 71.5°F
Oct 29 73.1°F 71.1°F 71.2°F
Oct 30 73.0°F 70.1°F 71.1°F
Oct 31 72.3°F 69.8°F 70.6°F
Nov 1 71.0°F 70.1°F 70.5°F
Nov 2 70.0°F 68.4°F 70.2°F
Nov 3 71.2°F 68.5°F 70.0°F
Nov 4 70.9°F 69.4°F 69.8°F
Nov 5 70.3°F 69.2°F 69.5°F
Nov 6 71.0°F 69.4°F 69.5°F
Nov 7 70.8°F 69.0°F 69.6°F
Nov 8 70.0°F 68.6°F 69.3°F
Nov 9 69.6°F 68.4°F 68.8°F
Nov 10 69.7°F 68.3°F 68.3°F
Nov 11 69.8°F 68.0°F 68.5°F
Nov 12 69.5°F 67.6°F 68.2°F
Nov 13 69.2°F 67.5°F 67.8°F
Nov 14 68.9°F 67.4°F 67.6°F
Nov 15 68.8°F 66.5°F 67.5°F
Nov 16 68.9°F 67.0°F 67.5°F
Nov 17 68.8°F 66.5°F 67.5°F
Nov 18 68.7°F 66.4°F 67.4°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 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, 60.6°F in Spring, 79.3°F in Summer, and 74.0°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Nagoya 70.6°F 21mi
Tsu 68.3°F 28mi
Hamamatsu 69.5°F 44mi

* current water temperature in this city

** straight line distance from Hekinan