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

80.8

°F

October 11, 05:30

Trend:

decreasing

Yesterday:

80.8°F

Tomorrow:

80.5°F

Sunrise:

06:21

Sunset:

17:53

Day Length:

11 h. 32 min.

Nagasaki in October

Minimum:

59.0°F

Average:

60.4°F

Maximum:

62.7°F

Sea water temperature in Nagasaki today

As of now, in Nagasaki, the water temperature is 80.8°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 4.1°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 fall a bit.

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 is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 79.5°F on 2021, while the historical minimum was 73.7°F on 2015.

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 shows a gradual cooling trend. The average temperature is expected to be 79.6°F, the minimum temperature may reach 79.1°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 27 83.1°F 82.4°F 78.9°F
Sep 28 82.5°F 82.0°F 79.0°F
Sep 29 81.8°F 82.6°F 78.9°F
Sep 30 81.8°F 81.4°F 78.8°F
Oct 1 81.6°F 81.6°F 78.6°F
Oct 2 81.8°F 81.0°F 78.4°F
Oct 3 81.3°F 80.6°F 78.2°F
Oct 4 80.8°F 80.9°F 78.2°F
Oct 5 80.0°F 79.9°F 77.9°F
Oct 6 80.7°F 79.3°F 77.7°F
Oct 7 80.8°F 79.0°F 77.5°F
Oct 8 80.1°F 78.5°F 77.3°F
Oct 9 81.0°F 79.3°F 77.3°F
Oct 10 80.8°F 78.8°F 76.7°F
Oct 11 80.8°F 78.3°F 76.7°F
Oct 12 80.5°F 77.9°F 76.4°F
Oct 13 79.9°F 77.3°F 75.9°F
Oct 14 79.7°F 77.1°F 75.7°F
Oct 15 79.6°F 77.2°F 75.5°F
Oct 16 79.5°F 77.1°F 75.4°F
Oct 17 79.2°F 77.9°F 75.2°F
Oct 18 79.1°F 78.3°F 75.0°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, 78.5°F in Summer, and 75.3°F in Autumn.