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

86.1

°F

August 29, 01:49

Trend:

decreasing

Yesterday:

86.4°F

Tomorrow:

86.1°F

Sunrise:

05:53

Sunset:

18:50

Day Length:

12 h. 57 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 86.1°F. Swimming in water of this temperature is considered highly warm and would be enjoyable for everyone. At this temperature, you can comfortably engage in water-based activities for extended periods without experiencing discomfort. Today's reading is 2.7°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 notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 85.6°F on 2023, while the historical minimum was 80.9°F on 2019.

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 85.3°F, the minimum temperature may reach 84.7°F, and the maximum might stay at 86.1°F.

Daily water temperature in Nagasaki

Date Current Year

actual* / forecast**

last year 10 years average
Aug 15 83.1°F 83.5°F 83.8°F
Aug 16 83.1°F 84.5°F 83.7°F
Aug 17 82.7°F 86.2°F 83.8°F
Aug 18 83.5°F 85.7°F 83.6°F
Aug 19 82.7°F 85.4°F 83.5°F
Aug 20 84.8°F 85.4°F 83.6°F
Aug 21 84.8°F 86.3°F 83.7°F
Aug 22 85.5°F 85.2°F 83.8°F
Aug 23 85.5°F 85.2°F 83.7°F
Aug 24 85.4°F 84.4°F 83.7°F
Aug 25 86.0°F 85.5°F 83.8°F
Aug 26 86.8°F 85.4°F 83.8°F
Aug 27 86.8°F 84.8°F 83.8°F
Aug 28 86.4°F 84.9°F 83.7°F
Aug 29 86.1°F 85.4°F 83.5°F
Aug 30 86.1°F 85.7°F 83.4°F
Aug 31 85.7°F 85.6°F 83.0°F
Sep 1 85.7°F 84.9°F 83.1°F
Sep 2 85.3°F 84.4°F 82.6°F
Sep 3 84.9°F 84.3°F 82.2°F
Sep 4 85.0°F 85.2°F 82.3°F
Sep 5 84.7°F 84.0°F 82.1°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.