All data are in degrees Fahrenheit

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Water temperature in Nagasaki

Detailed information about the current water temperature in Nagasaki. 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 Nagasaki now

62.2

°F

April 9, 17:18

Trend:

stable

Yesterday:

63.1°F

Tomorrow:

62.5°F

Sunrise:

05:59

Sunset:

18:46

Day Length:

12 h. 47 min.

Nagasaki in April

Minimum:

59.2°F

Average:

61.1°F

Maximum:

62.8°F

Sea water temperature in Nagasaki today

As of now, in Nagasaki, the water temperature is 62.2°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 1.1°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 rise a bit.

Recent sea temperature and forecast

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 62.6°F on 2016, while the historical minimum was 59.5°F on 2025.

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 62.8°F, with minimum temperature starting at 62.5°F, while the maximum might reach 63.1°F.

Daily water temperature in Nagasaki

Date Current Year

actual* / forecast**

last year 10 years average
Mar 26 61.0°F 56.2°F 59.5°F
Mar 27 60.9°F 57.1°F 59.7°F
Mar 28 60.9°F 58.3°F 60.0°F
Mar 29 59.6°F 58.8°F 60.0°F
Mar 30 59.6°F 59.0°F 59.7°F
Mar 31 60.8°F 57.6°F 60.1°F
Apr 1 61.0°F 58.0°F 60.3°F
Apr 2 63.1°F 58.4°F 60.8°F
Apr 3 63.3°F 57.4°F 60.7°F
Apr 4 63.2°F 55.7°F 60.9°F
Apr 5 63.6°F 56.4°F 61.0°F
Apr 6 63.1°F 57.0°F 61.1°F
Apr 7 63.5°F 57.2°F 61.0°F
Apr 8 63.1°F 58.3°F 61.0°F
Apr 9 62.2°F 59.5°F 61.2°F
Apr 10 62.5°F 59.8°F 61.4°F
Apr 11 62.5°F 59.7°F 61.4°F
Apr 12 62.5°F 60.9°F 61.4°F
Apr 13 62.8°F 61.0°F 61.7°F
Apr 14 62.9°F 60.2°F 61.8°F
Apr 15 63.1°F 60.0°F 62.0°F
Apr 16 63.1°F 59.6°F 62.0°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 Nagasaki by month

In Nagasaki, the months July through October offer comfortable swimming conditions, which amounts to 135 swimming days.
The warmest water in Nagasaki was recorded on August 5, 2024, reaching a 88.0°F. While the coldest temperature occurred on February 27, 2025, dipping to 54.7°F. The average readings by season are 60.8°F in Winter, 62.6°F in Spring, 78.8°F in Summer, and 75.6°F in Autumn.