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

85.2

°F

July 18, 20:13

Trend:

increasing

Yesterday:

83.8°F

Tomorrow:

85.4°F

Sunrise:

04:51

Sunset:

19:05

Day Length:

14 h. 14 min.

Hekinan in July

Minimum:

50.9°F

Average:

55.0°F

Maximum:

60.3°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 85.2°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 4.1°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a noticeable increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to rise 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 85.8°F on 2023, while the historical minimum was 77.8°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 suggests a gradual increase. The average temperature is expected to rise up to 86.2°F, with minimum temperature starting at 85.4°F, while the maximum might reach 86.9°F.

Daily water temperature in Hekinan

Date Current Year

actual* / forecast**

last year 10 years average
Jul 4 76.9°F 82.6°F 78.5°F
Jul 5 77.7°F 84.4°F 78.9°F
Jul 6 77.5°F 84.7°F 79.1°F
Jul 7 77.1°F 83.6°F 79.1°F
Jul 8 76.8°F 83.3°F 79.1°F
Jul 9 77.6°F 84.7°F 79.5°F
Jul 10 79.4°F 84.3°F 79.6°F
Jul 11 80.1°F 85.5°F 79.8°F
Jul 12 78.0°F 84.4°F 79.9°F
Jul 13 78.3°F 84.1°F 80.0°F
Jul 14 80.9°F 84.0°F 80.2°F
Jul 15 82.8°F 84.3°F 80.7°F
Jul 16 83.2°F 83.3°F 80.8°F
Jul 17 83.8°F 83.0°F 81.3°F
Jul 18 85.2°F 82.4°F 81.1°F
Jul 19 85.4°F 81.9°F 81.3°F
Jul 20 85.9°F 82.4°F 81.8°F
Jul 21 85.9°F 83.4°F 81.8°F
Jul 22 86.3°F 83.9°F 82.1°F
Jul 23 86.5°F 84.5°F 82.4°F
Jul 24 86.6°F 85.7°F 82.5°F
Jul 25 86.9°F 86.3°F 82.8°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 84.4°F 21mi
Tsu 82.0°F 28mi
Hamamatsu 78.7°F 44mi

* current water temperature in this city

** straight line distance from Hekinan