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

82.7

°F

September 18, 01:03

Trend:

decreasing

Yesterday:

83.0°F

Tomorrow:

82.5°F

Sunrise:

05:37

Sunset:

17:56

Day Length:

12 h. 19 min.

Hekinan in September

Minimum:

50.9°F

Average:

54.7°F

Maximum:

59.8°F

Sea water temperature in Hekinan today

As of now, in Hekinan, the water temperature is 82.7°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 2.9°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 85.5°F on 2024, while the historical minimum was 74.8°F on 2015.

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 81.6°F, the minimum temperature may reach 80.6°F, and the maximum might stay at 82.5°F.

Daily water temperature in Hekinan

Date Current Year

actual* / forecast**

last year 10 years average
Sep 4 84.7°F 81.5°F 82.3°F
Sep 5 84.2°F 82.9°F 82.0°F
Sep 6 83.2°F 84.1°F 81.9°F
Sep 7 82.6°F 86.2°F 81.8°F
Sep 8 83.9°F 85.6°F 81.6°F
Sep 9 84.2°F 85.4°F 81.6°F
Sep 10 84.6°F 85.7°F 81.6°F
Sep 11 84.7°F 85.8°F 81.4°F
Sep 12 83.5°F 85.6°F 81.3°F
Sep 13 83.2°F 86.6°F 81.2°F
Sep 14 81.9°F 87.3°F 81.0°F
Sep 15 82.9°F 86.6°F 80.7°F
Sep 16 83.5°F 85.6°F 80.6°F
Sep 17 83.0°F 85.7°F 80.1°F
Sep 18 82.7°F 85.5°F 79.8°F
Sep 19 82.5°F 86.5°F 79.6°F
Sep 20 82.3°F 86.4°F 79.4°F
Sep 21 81.9°F 85.8°F 79.1°F
Sep 22 81.5°F 85.3°F 78.6°F
Sep 23 81.4°F 84.2°F 78.5°F
Sep 24 81.2°F 83.1°F 78.3°F
Sep 25 80.6°F 81.7°F 77.7°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 123 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 73.7°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Nagoya 84.7°F 21mi
Tsu 83.2°F 28mi
Hamamatsu 80.9°F 44mi

* current water temperature in this city

** straight line distance from Hekinan