What is the current water temperature in Katsuura?

As of now, in Katsuura, the water temperature is 23.0°C. It's safe to say that the water is comfortably warm for various water-related activities.

Japan > Katsuura

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.

73.4

°F

June 27, 12:23

Trend:

increasing

Yesterday:

73.3°F

Tomorrow:

73.8°F

Sunrise:

04:26

Sunset:

18:57

Day Length:

14 h. 31 min.

Katsuura in July

Minimum:

60.6°F

Average:

63.5°F

Maximum:

66.2°F

Sea water temperature in Katsuura today

As of now, in Katsuura, the water temperature is 73.4°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 1.8°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

The water temperature today is above average for the last two weeks, showing a small increase in temperature. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 74.8°F on 2025, while the historical minimum was 66.8°F on 2022.

latest data

last year

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 74.2°F, with minimum temperature starting at 73.7°F, while the maximum might reach 75.0°F.

Daily water temperature in Katsuura

Date	Current Year actual* / forecast**	last year	10 years average
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	70.1°F
Jun 20	72.3°F	72.9°F	70.7°F
Jun 21	73.0°F	74.0°F	71.2°F
Jun 22	72.9°F	74.8°F	71.0°F
Jun 23	72.9°F	74.1°F	71.3°F
Jun 24	73.0°F	73.5°F	71.4°F
Jun 25	73.4°F	73.8°F	71.1°F
Jun 26	73.3°F	75.3°F	71.5°F
Jun 27	73.4°F	74.8°F	71.6°F
Jun 28	73.8°F	75.3°F	71.9°F
Jun 29	74.0°F	74.1°F	72.2°F
Jun 30	73.7°F	73.5°F	71.9°F
Jul 1	74.0°F	74.8°F	72.2°F
Jul 2	74.0°F	76.0°F	72.1°F
Jul 3	74.7°F	74.7°F	72.8°F
Jul 4	75.0°F	76.1°F	73.1°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	72.9°F	8mi
Kisarazu	72.3°F	27mi
Ichihara	73.1°F	29mi
Kimitsu	72.2°F	29mi
Futtsu	72.1°F	30mi
Chiba	73.0°F	33mi
Yokosuka	72.2°F	38mi
Yokohama	72.5°F	42mi
Kawasaki	72.4°F	42mi
Honchō	72.7°F	43mi

* current water temperature in this city

** straight line distance from Katsuura