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

86.3

°F

August 27, 09:12

Trend:

decreasing

Yesterday:

86.5°F

Tomorrow:

85.9°F

Sunrise:

05:21

Sunset:

18:26

Day Length:

13 h. 5 min.

Hekinan in September

Minimum:

50.9°F

Average:

54.2°F

Maximum:

59.8°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 86.3°F. Swimming in water of this temperature is considered highly warm and would be enjoyable for everyone. At this temperature, you can comfortably engage in water-based activities for extended periods without experiencing discomfort. Today's reading is 2.4°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 notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 86.3°F on 2024, while the historical minimum was 82.4°F on 2019.

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 histoorical minimum and others when it was close to the historical maximum. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 85.6°F, the minimum temperature may reach 85.1°F, and the maximum might stay at 85.9°F.

Daily water temperature in Hekinan

Date Current Year

actual* / forecast**

last year 10 years average
Aug 13 82.9°F 84.4°F 83.9°F
Aug 14 81.2°F 84.1°F 83.7°F
Aug 15 82.9°F 83.3°F 83.8°F
Aug 16 83.7°F 85.2°F 84.1°F
Aug 17 83.2°F 85.7°F 83.5°F
Aug 18 83.5°F 85.2°F 83.6°F
Aug 19 83.0°F 85.1°F 83.3°F
Aug 20 84.2°F 87.1°F 83.6°F
Aug 21 84.0°F 86.1°F 83.7°F
Aug 22 84.5°F 86.3°F 83.8°F
Aug 23 84.5°F 85.4°F 84.1°F
Aug 24 85.0°F 84.9°F 83.9°F
Aug 25 85.6°F 84.6°F 83.7°F
Aug 26 86.5°F 85.0°F 84.1°F
Aug 27 86.3°F 84.8°F 83.9°F
Aug 28 85.9°F 85.1°F 83.4°F
Aug 29 85.7°F 85.0°F 83.3°F
Aug 30 85.8°F 85.2°F 83.4°F
Aug 31 85.8°F 84.5°F 83.4°F
Sep 1 85.6°F 85.4°F 83.2°F
Sep 2 85.3°F 85.9°F 82.9°F
Sep 3 85.1°F 85.3°F 82.7°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, 79.2°F in Summer, and 74.0°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Nagoya 86.3°F 21mi
Tsu 84.6°F 28mi
Hamamatsu 82.6°F 44mi

* current water temperature in this city

** straight line distance from Hekinan