What is the current water temperature in Nagasaki?

Q: What is the current water temperature in Nagasaki?

As of now, in Nagasaki, the water temperature is 18.03°C. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it.

Japan > Nagasaki

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.

64.5

°F

May 10, 05:56

Trend:

stable

Yesterday:

64.5°F

Tomorrow:

64.7°F

Sunrise:

05:26

Sunset:

19:08

Day Length:

13 h. 42 min.

Nagasaki in May

Minimum:

59.3°F

Average:

60.8°F

Maximum:

62.7°F

Sea water temperature in Nagasaki today

As of now, in Nagasaki, the water temperature is 64.5°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 0.9°F lower 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 rise a bit.

Recent sea temperature and forecast

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 67.2°F on 2022, while the historical minimum was 63.8°F on 2018.

latest data

last year

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 65.2°F, with minimum temperature starting at 64.7°F, while the maximum might reach 66.0°F.

Daily water temperature in Nagasaki

Date	Current Year actual* / forecast**	last year	10 years average
Apr 26	62.3°F	64.9°F	63.4°F
Apr 27	62.7°F	64.9°F	63.4°F
Apr 28	63.9°F	65.4°F	63.6°F
Apr 29	63.7°F	65.5°F	63.7°F
Apr 30	63.2°F	65.6°F	63.8°F
May 1	63.4°F	65.6°F	64.2°F
May 2	64.5°F	65.4°F	64.6°F
May 3	63.7°F	65.5°F	64.5°F
May 4	63.9°F	65.5°F	64.4°F
May 5	63.5°F	65.8°F	64.4°F
May 6	63.7°F	65.9°F	64.7°F
May 7	63.8°F	66.0°F	65.0°F
May 8	64.4°F	65.6°F	65.2°F
May 9	64.5°F	65.4°F	65.3°F
May 10	64.5°F	65.2°F	65.3°F
May 11	64.7°F	65.4°F	65.6°F
May 12	64.8°F	65.5°F	65.7°F
May 13	65.0°F	65.7°F	65.9°F
May 14	65.1°F	65.8°F	66.0°F
May 15	65.4°F	66.5°F	66.2°F
May 16	65.7°F	66.4°F	66.5°F
May 17	66.0°F	65.8°F	66.9°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.