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

81.0

°F

September 19, 09:18

Trend:

decreasing

Yesterday:

81.3°F

Tomorrow:

80.5°F

Sunrise:

06:06

Sunset:

18:22

Day Length:

12 h. 16 min.

Nagasaki in September

Minimum:

59.0°F

Average:

60.8°F

Maximum:

62.8°F

Sea water temperature in Nagasaki today

As of now, in Nagasaki, the water temperature is 81.0°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is about the same as 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 considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. 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 86.7°F on 2024, while the historical minimum was 77.9°F on 2017.

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 shows a gradual cooling trend. The average temperature is expected to be 79.8°F, the minimum temperature may reach 79.3°F, and the maximum might stay at 80.5°F.

Daily water temperature in Nagasaki

Date Current Year

actual* / forecast**

last year 10 years average
Sep 5 84.5°F 84.0°F 82.3°F
Sep 6 83.4°F 84.8°F 82.2°F
Sep 7 83.2°F 85.0°F 82.0°F
Sep 8 83.1°F 84.8°F 81.6°F
Sep 9 82.5°F 84.6°F 81.5°F
Sep 10 81.6°F 84.2°F 81.4°F
Sep 11 81.3°F 85.2°F 81.6°F
Sep 12 81.2°F 84.9°F 81.7°F
Sep 13 80.7°F 84.7°F 81.7°F
Sep 14 80.7°F 84.2°F 81.5°F
Sep 15 80.7°F 83.7°F 81.4°F
Sep 16 81.4°F 83.7°F 81.4°F
Sep 17 81.2°F 85.2°F 81.5°F
Sep 18 81.3°F 84.8°F 81.3°F
Sep 19 81.0°F 84.6°F 81.0°F
Sep 20 80.5°F 84.3°F 80.5°F
Sep 21 80.3°F 84.0°F 80.3°F
Sep 22 80.0°F 83.3°F 80.0°F
Sep 23 79.6°F 82.7°F 79.7°F
Sep 24 79.4°F 83.1°F 79.5°F
Sep 25 79.3°F 82.5°F 79.3°F
Sep 26 79.3°F 82.9°F 79.3°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 137 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, 62.7°F in Spring, 78.9°F in Summer, and 75.6°F in Autumn.