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

73.1

°F

June 20, 12:00

Trend:

increasing

Yesterday:

72.5°F

Tomorrow:

73.6°F

Sunrise:

04:24

Sunset:

18:56

Day Length:

14 h. 32 min.

Katsuura in June

Minimum:

59.5°F

Average:

63.5°F

Maximum:

66.9°F

Sea water temperature in Katsuura today

As of now, in Katsuura, the water temperature is 73.1°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 2.6°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. 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 is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 72.9°F on 2025, while the historical minimum was 68.2°F on 2020.

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 73.7°F, with minimum temperature starting at 73.3°F, while the maximum might reach 74.1°F.

Daily water temperature in Katsuura

Date Current Year

actual* / forecast**

last year 10 years average
Jun 6 70.3°F 70.3°F 69.1°F
Jun 7 70.8°F 70.4°F 69.1°F
Jun 8 71.0°F 70.5°F 69.4°F
Jun 9 71.0°F 70.7°F 69.0°F
Jun 10 71.0°F 70.7°F 69.4°F
Jun 11 72.4°F 70.6°F 69.8°F
Jun 12 73.2°F 70.5°F 70.1°F
Jun 13 73.5°F 70.5°F 70.0°F
Jun 14 72.9°F 70.8°F 69.6°F
Jun 15 72.3°F 71.0°F 69.7°F
Jun 16 72.1°F 71.3°F 69.9°F
Jun 17 72.3°F 72.1°F 69.6°F
Jun 18 72.3°F 70.3°F 69.9°F
Jun 19 72.5°F 70.6°F 69.9°F
Jun 20 73.1°F 72.9°F 70.5°F
Jun 21 73.6°F 74.0°F 71.0°F
Jun 22 73.3°F 74.8°F 70.8°F
Jun 23 73.7°F 74.1°F 71.1°F
Jun 24 73.8°F 73.5°F 71.2°F
Jun 25 73.4°F 73.8°F 70.8°F
Jun 26 74.0°F 75.3°F 71.5°F
Jun 27 74.1°F 74.8°F 71.6°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, 62.8°F in Spring, 74.9°F in Summer, and 75.1°F in Autumn.

Popular neighboring cities and resorts

City Water temperature* Distance**
Isumi 72.3°F 8mi
Kisarazu 72.3°F 27mi
Ichihara 72.4°F 29mi
Kimitsu 72.0°F 29mi
Futtsu 71.3°F 30mi
Chiba 72.4°F 33mi
Yokosuka 69.8°F 38mi
Yokohama 71.7°F 42mi
Kawasaki 72.1°F 42mi
Honchō 72.7°F 43mi

* current water temperature in this city

** straight line distance from Katsuura