What is the current water temperature in Nagasaki?

As of now, in Nagasaki, the water temperature is 27.13°C. It's safe to say that the water is comfortably warm for various water-related activities.

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.

80.8

°F

July 17, 22:16

Trend:

stable

Yesterday:

81.6°F

Tomorrow:

81.0°F

Sunrise:

05:24

Sunset:

19:29

Day Length:

14 h. 5 min.

Nagasaki in July

Minimum:

59.6°F

Average:

60.9°F

Maximum:

62.2°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 0.8°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 rise a bit.

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 also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 82.8°F on 2025, while the historical minimum was 76.6°F on 2020.

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 histoorical minimum and others when it was close to the historical maximum. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 81.6°F, with minimum temperature starting at 81.0°F, while the maximum might reach 82.1°F.

Daily water temperature in Nagasaki

Date	Current Year actual* / forecast**	last year	10 years average
Jul 3	76.4°F	82.5°F	77.3°F
Jul 4	76.1°F	82.4°F	77.5°F
Jul 5	76.3°F	82.0°F	77.5°F
Jul 6	77.5°F	83.2°F	78.0°F
Jul 7	76.7°F	84.5°F	78.1°F
Jul 8	77.2°F	84.9°F	78.4°F
Jul 9	78.0°F	84.0°F	78.5°F
Jul 10	78.8°F	84.3°F	78.9°F
Jul 11	78.5°F	84.3°F	79.1°F
Jul 12	80.9°F	84.5°F	79.1°F
Jul 13	80.5°F	84.3°F	79.2°F
Jul 14	80.2°F	83.8°F	79.4°F
Jul 15	81.7°F	82.0°F	79.6°F
Jul 16	81.6°F	82.1°F	79.8°F
Jul 17	80.8°F	82.8°F	80.0°F
Jul 18	81.0°F	82.6°F	80.1°F
Jul 19	81.2°F	82.4°F	80.4°F
Jul 20	81.4°F	82.6°F	80.6°F
Jul 21	81.7°F	81.9°F	80.9°F
Jul 22	81.9°F	82.6°F	81.1°F
Jul 23	82.1°F	84.2°F	81.2°F
Jul 24	82.1°F	83.9°F	81.3°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, 78.8°F in Summer, and 75.6°F in Autumn.