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

79.6

°F

October 3, 12:33

Trend:

decreasing

Yesterday:

79.8°F

Tomorrow:

79.6°F

Sunrise:

06:15

Sunset:

18:04

Day Length:

11 h. 49 min.

Nagasaki in October

Minimum:

59.0°F

Average:

60.6°F

Maximum:

62.7°F

Sea water temperature in Nagasaki today

As of now, in Nagasaki, the water temperature is 79.6°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 1.2°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 stay about the same.

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 also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 81.3°F on 2025, while the historical minimum was 75.7°F on 2018.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 79.0°F, the minimum temperature may reach 78.6°F, and the maximum might stay at 79.6°F.

Daily water temperature in Nagasaki

Date Current Year

actual* / forecast**

last year 10 years average
Sep 19 80.9°F 84.6°F 81.0°F
Sep 20 81.0°F 84.3°F 80.6°F
Sep 21 80.6°F 84.0°F 80.3°F
Sep 22 80.6°F 83.3°F 80.1°F
Sep 23 80.1°F 82.7°F 79.7°F
Sep 24 80.1°F 83.1°F 79.5°F
Sep 25 80.2°F 82.5°F 79.4°F
Sep 26 80.2°F 82.9°F 79.4°F
Sep 27 79.7°F 83.1°F 79.3°F
Sep 28 80.1°F 82.5°F 79.3°F
Sep 29 79.7°F 81.8°F 79.3°F
Sep 30 79.4°F 81.8°F 79.1°F
Oct 1 79.8°F 81.6°F 79.0°F
Oct 2 79.8°F 81.8°F 78.7°F
Oct 3 79.6°F 81.3°F 78.5°F
Oct 4 79.6°F 80.8°F 78.4°F
Oct 5 79.2°F 80.0°F 78.1°F
Oct 6 79.2°F 80.7°F 78.0°F
Oct 7 78.9°F 80.8°F 77.7°F
Oct 8 78.7°F 80.1°F 77.5°F
Oct 9 78.7°F 81.0°F 77.6°F
Oct 10 78.6°F 80.8°F 77.5°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 75.7°F in Autumn.