All data are in degrees Fahrenheit

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Water temperature in Katsuura

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

78.0

°F

August 30, 04:21

Trend:

decreasing

Yesterday:

78.2°F

Tomorrow:

78.0°F

Sunrise:

05:09

Sunset:

18:09

Day Length:

13 h. 0 min.

Katsuura in September

Minimum:

61.5°F

Average:

63.9°F

Maximum:

66.4°F

Sea water temperature in Katsuura today

As of now, in Katsuura, the water temperature is 78.0°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 1.5°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 stay about the same.

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 minimum temperature for this date. The maximum temperature recorded for this date was 82.4°F on 2020, while the historical minimum was 76.5°F on 2022.

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 shows a gradual cooling trend. The average temperature is expected to be 77.5°F, the minimum temperature may reach 77.2°F, and the maximum might stay at 78.0°F.

Daily water temperature in Katsuura

Date Current Year

actual* / forecast**

last year 10 years average
Aug 16 77.6°F 82.8°F 79.9°F
Aug 17 77.9°F 83.0°F 79.7°F
Aug 18 78.8°F 82.6°F 79.4°F
Aug 19 77.9°F 82.7°F 79.3°F
Aug 20 78.5°F 82.0°F 79.4°F
Aug 21 79.2°F 82.3°F 79.3°F
Aug 22 78.8°F 82.3°F 79.3°F
Aug 23 80.1°F 82.7°F 79.9°F
Aug 24 79.8°F 80.9°F 79.6°F
Aug 25 78.9°F 80.7°F 79.0°F
Aug 26 79.7°F 80.6°F 79.8°F
Aug 27 79.0°F 81.0°F 79.9°F
Aug 28 78.5°F 79.7°F 79.6°F
Aug 29 78.2°F 78.8°F 79.7°F
Aug 30 78.0°F 78.8°F 79.5°F
Aug 31 78.0°F 78.6°F 79.5°F
Sep 1 77.6°F 78.6°F 79.1°F
Sep 2 77.6°F 78.9°F 79.2°F
Sep 3 77.2°F 78.6°F 78.7°F
Sep 4 77.3°F 77.8°F 78.8°F
Sep 5 77.5°F 78.6°F 79.1°F
Sep 6 77.5°F 76.2°F 79.0°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 Katsuura by month

In Katsuura, the months July through October offer comfortable swimming conditions, which amounts to 115 swimming days.
The warmest water in Katsuura was recorded on September 16, 2024, reaching a 83.3°F. While the coldest temperature occurred on April 16, 2025, dipping to 56.7°F. The average readings by season are 63.3°F in Winter, 62.8°F in Spring, 74.8°F in Summer, and 74.9°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Isumi 76.9°F 8mi
Kisarazu 83.0°F 27mi
Ichihara 87.1°F 29mi
Kimitsu 82.4°F 29mi
Futtsu 81.4°F 30mi
Chiba 87.3°F 33mi
Yokosuka 80.0°F 38mi
Yokohama 82.4°F 42mi
Kawasaki 83.2°F 42mi
Honchō 85.1°F 43mi

* current water temperature in this city

** straight line distance from Katsuura