All data are in degrees Fahrenheit

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Water temperature in Tokyo

Detailed information about the current water temperature in Tokyo. 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 Tokyo now

83.2

°F

July 22, 01:33

Trend:

increasing

Yesterday:

83.1°F

Tomorrow:

83.2°F

Sunrise:

04:41

Sunset:

18:54

Day Length:

14 h. 13 min.

Tokyo in July

Minimum:

52.6°F

Average:

54.2°F

Maximum:

58.0°F

Sea water temperature in Tokyo today

As of now, in Tokyo, the water temperature is 83.2°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 3.0°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 83.1°F on 2025, while the historical minimum was 75.3°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 suggests a gradual increase. The average temperature is expected to rise up to 84.0°F, with minimum temperature starting at 83.2°F, while the maximum might reach 84.4°F.

Daily water temperature in Tokyo

Date Current Year

actual* / forecast**

last year 10 years average
Jul 8 74.8°F 83.0°F 77.4°F
Jul 9 75.4°F 83.7°F 77.8°F
Jul 10 77.1°F 82.8°F 77.8°F
Jul 11 75.5°F 82.3°F 77.8°F
Jul 12 75.5°F 81.9°F 78.0°F
Jul 13 75.3°F 81.5°F 77.8°F
Jul 14 76.0°F 81.5°F 78.1°F
Jul 15 79.4°F 81.0°F 78.6°F
Jul 16 79.4°F 80.6°F 78.9°F
Jul 17 80.3°F 79.3°F 79.1°F
Jul 18 80.0°F 82.2°F 79.3°F
Jul 19 80.3°F 80.7°F 79.5°F
Jul 20 81.7°F 81.0°F 80.0°F
Jul 21 83.1°F 82.3°F 80.1°F
Jul 22 83.2°F 83.1°F 80.2°F
Jul 23 83.2°F 82.1°F 80.2°F
Jul 24 83.4°F 82.5°F 80.4°F
Jul 25 83.8°F 82.5°F 80.8°F
Jul 26 84.3°F 83.6°F 81.3°F
Jul 27 84.3°F 84.4°F 81.3°F
Jul 28 84.4°F 83.0°F 81.4°F
Jul 29 84.4°F 83.2°F 81.4°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 Tokyo by month

In Tokyo, the months July through September offer comfortable swimming conditions, which amounts to 105 swimming days.
The warmest water in Tokyo was recorded on July 30, 2024, reaching a 88.2°F. While the coldest temperature occurred on February 15, 2022, dipping to 47.3°F. The average readings by season are 54.7°F in Winter, 60.5°F in Spring, 77.8°F in Summer, and 71.8°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Kawasaki 83.0°F 12mi
Matsudo 84.7°F 13mi
Honchō 84.7°F 17mi
Yokohama 82.7°F 18mi
Chiba 84.5°F 25mi
Ichihara 84.8°F 25mi
Kisarazu 83.4°F 25mi
Kimitsu 82.3°F 25mi
Fujisawa 82.4°F 26mi
Futtsu 81.1°F 27mi

* current water temperature in this city

** straight line distance from Tokyo