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

69.1

°F

May 31, 15:06

Trend:

increasing

Yesterday:

68.9°F

Tomorrow:

69.3°F

Sunrise:

05:14

Sunset:

19:22

Day Length:

14 h. 8 min.

Nagasaki in June

Minimum:

59.4°F

Average:

60.9°F

Maximum:

62.6°F

Sea water temperature in Nagasaki today

As of now, in Nagasaki, the water temperature is 69.1°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 0.7°F lower than the average recorded on this particular day in recent years. Since yesterday, there was a slight 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 minimum temperature for this date. The maximum temperature recorded for this date was 71.2°F on 2022, while the historical minimum was 68.5°F on 2024.

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 minimum recorded over the past years. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 69.8°F, with minimum temperature starting at 69.3°F, while the maximum might reach 70.2°F.

Daily water temperature in Nagasaki

Date Current Year

actual* / forecast**

last year 10 years average
May 17 65.8°F 65.8°F 66.8°F
May 18 66.1°F 66.0°F 67.2°F
May 19 66.3°F 67.5°F 67.2°F
May 20 66.5°F 68.5°F 67.4°F
May 21 66.8°F 67.9°F 67.6°F
May 22 67.8°F 68.2°F 67.9°F
May 23 69.1°F 68.2°F 68.5°F
May 24 69.1°F 68.3°F 68.4°F
May 25 67.7°F 69.7°F 68.9°F
May 26 67.7°F 69.0°F 69.2°F
May 27 67.2°F 69.1°F 69.3°F
May 28 69.1°F 69.1°F 69.6°F
May 29 69.0°F 68.6°F 69.5°F
May 30 68.9°F 68.4°F 69.6°F
May 31 69.1°F 68.5°F 69.8°F
Jun 1 69.3°F 68.6°F 70.1°F
Jun 2 69.5°F 68.7°F 70.3°F
Jun 3 69.6°F 68.6°F 70.4°F
Jun 4 70.1°F 69.7°F 70.8°F
Jun 5 70.1°F 69.1°F 70.8°F
Jun 6 70.0°F 69.4°F 70.8°F
Jun 7 70.2°F 69.9°F 71.0°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 131 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 60.7°F in Winter, 62.5°F in Spring, 78.3°F in Summer, and 75.1°F in Autumn.