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

59.3

°F

March 22, 00:39

Trend:

stable

Yesterday:

59.3°F

Tomorrow:

59.4°F

Sunrise:

06:23

Sunset:

18:33

Day Length:

12 h. 10 min.

Nagasaki in March

Minimum:

59.5°F

Average:

61.2°F

Maximum:

62.7°F

Sea water temperature in Nagasaki today

As of now, in Nagasaki, the water temperature is 59.3°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 0.2°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 rise a bit.

Recent sea temperature and forecast

Today's water temperature slightly varies from the average of the past two weeks. It also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 61.6°F on 2021, while the historical minimum was 55.1°F on 2025.

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 maximum recorded over the past years. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 59.7°F, with minimum temperature starting at 59.4°F, while the maximum might reach 60.2°F.

Daily water temperature in Nagasaki

Date Current Year

actual* / forecast**

last year 10 years average
Mar 8 59.0°F 56.4°F 58.1°F
Mar 9 59.7°F 56.6°F 58.4°F
Mar 10 59.1°F 56.2°F 58.2°F
Mar 11 58.3°F 56.8°F 58.2°F
Mar 12 59.4°F 55.9°F 58.5°F
Mar 13 59.7°F 56.3°F 58.6°F
Mar 14 60.0°F 56.8°F 58.9°F
Mar 15 59.0°F 57.3°F 58.8°F
Mar 16 58.4°F 57.7°F 58.8°F
Mar 17 58.0°F 58.1°F 58.8°F
Mar 18 59.6°F 58.2°F 59.1°F
Mar 19 60.4°F 58.0°F 59.2°F
Mar 20 58.8°F 57.8°F 59.0°F
Mar 21 59.3°F 56.1°F 59.1°F
Mar 22 59.3°F 55.1°F 59.1°F
Mar 23 59.4°F 55.4°F 59.2°F
Mar 24 59.4°F 57.3°F 59.2°F
Mar 25 59.4°F 55.7°F 59.2°F
Mar 26 59.5°F 56.2°F 59.3°F
Mar 27 59.8°F 57.1°F 59.6°F
Mar 28 60.1°F 58.3°F 59.9°F
Mar 29 60.2°F 58.8°F 60.0°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.