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

75.2

°F

October 18, 07:02

Trend:

decreasing

Yesterday:

75.3°F

Tomorrow:

74.8°F

Sunrise:

06:00

Sunset:

17:15

Day Length:

11 h. 15 min.

Hekinan in October

Minimum:

51.1°F

Average:

53.8°F

Maximum:

59.2°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 75.2°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 1.2°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 slightly 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 76.2°F on 2022, while the historical minimum was 72.6°F on 2020.

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 73.9°F, the minimum temperature may reach 73.1°F, and the maximum might stay at 74.8°F.

Daily water temperature in Hekinan

Date Current Year

actual* / forecast**

last year 10 years average
Oct 4 77.4°F 75.9°F 76.5°F
Oct 5 76.5°F 75.5°F 76.1°F
Oct 6 77.7°F 77.8°F 76.6°F
Oct 7 77.1°F 77.1°F 76.2°F
Oct 8 76.9°F 75.4°F 75.7°F
Oct 9 76.3°F 76.7°F 75.7°F
Oct 10 74.2°F 77.0°F 75.3°F
Oct 11 75.1°F 76.5°F 75.2°F
Oct 12 75.4°F 76.0°F 74.9°F
Oct 13 76.3°F 77.0°F 75.0°F
Oct 14 76.5°F 76.1°F 74.9°F
Oct 15 75.8°F 75.7°F 74.6°F
Oct 16 75.5°F 74.4°F 74.4°F
Oct 17 75.3°F 75.2°F 74.1°F
Oct 18 75.2°F 74.6°F 74.1°F
Oct 19 74.8°F 74.3°F 73.7°F
Oct 20 74.6°F 75.1°F 73.4°F
Oct 21 74.4°F 74.6°F 73.2°F
Oct 22 73.8°F 74.0°F 72.6°F
Oct 23 73.5°F 73.5°F 72.4°F
Oct 24 73.3°F 71.7°F 72.1°F
Oct 25 73.1°F 71.3°F 71.9°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 76.7°F 21mi
Tsu 73.1°F 28mi
Hamamatsu 74.5°F 44mi

* current water temperature in this city

** straight line distance from Hekinan