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

59.1

°F

January 14, 17:49

Trend:

decreasing

Yesterday:

60.2°F

Tomorrow:

58.8°F

Sunrise:

06:47

Sunset:

16:48

Day Length:

10 h. 1 min.

Katsuura in January

Minimum:

59.7°F

Average:

64.2°F

Maximum:

67.7°F

Sea water temperature in Katsuura today

As of now, in Katsuura, the water temperature is 59.1°F. Swimming in water of this temperature is considered as extremely cold, and there's a substantial risk of hypothermia if exposed for more than a brief duration. Today's reading is 3.8°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 fall a bit.

Recent sea temperature and forecast

Today's water temperature is considerably 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 66.5°F on 2020, while the historical minimum was 58.7°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 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 58.6°F, the minimum temperature may reach 58.2°F, and the maximum might stay at 58.8°F.

Daily water temperature in Katsuura

Date Current Year

actual* / forecast**

last year 10 years average
Jan 1 63.4°F 62.5°F 64.2°F
Jan 2 64.9°F 61.9°F 64.3°F
Jan 3 63.2°F 61.4°F 63.7°F
Jan 4 63.8°F 62.5°F 63.9°F
Jan 5 62.9°F 63.4°F 64.0°F
Jan 6 61.3°F 61.6°F 63.5°F
Jan 7 64.0°F 63.3°F 63.5°F
Jan 8 64.3°F 63.7°F 63.8°F
Jan 9 64.8°F 63.4°F 64.0°F
Jan 10 65.3°F 61.3°F 63.7°F
Jan 11 65.6°F 63.1°F 63.7°F
Jan 12 61.0°F 65.2°F 63.1°F
Jan 13 60.2°F 64.8°F 63.0°F
Jan 14 59.1°F 62.9°F 62.8°F
Jan 15 58.8°F 63.0°F 62.5°F
Jan 16 58.6°F 62.6°F 62.3°F
Jan 17 58.8°F 61.6°F 62.6°F
Jan 18 58.7°F 60.3°F 62.5°F
Jan 19 58.6°F 62.5°F 62.3°F
Jan 20 58.4°F 62.1°F 62.2°F
Jan 21 58.2°F 60.6°F 62.0°F
Dec 31 64.5°F 63.1°F 64.5°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 118 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, 62.7°F in Spring, 74.9°F in Summer, and 75.1°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Isumi 58.3°F 8mi
Kisarazu 54.4°F 27mi
Ichihara 51.5°F 29mi
Kimitsu 54.4°F 29mi
Futtsu 56.3°F 30mi
Chiba 51.4°F 33mi
Yokosuka 58.0°F 38mi
Yokohama 54.9°F 42mi
Kawasaki 52.6°F 42mi
Honchō 51.2°F 43mi

* current water temperature in this city

** straight line distance from Katsuura