What is the current water temperature in Katsuura?

Q: What is the current water temperature in Katsuura?

As of now, in Katsuura, the water temperature is 15.74°C. 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.

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.

60.3

°F

March 28, 03:42

Trend:

stable

Yesterday:

60.2°F

Tomorrow:

60.2°F

Sunrise:

05:32

Sunset:

17:56

Day Length:

12 h. 24 min.

Katsuura in April

Minimum:

61.4°F

Average:

63.9°F

Maximum:

67.9°F

Sea water temperature in Katsuura today

As of now, in Katsuura, the water temperature is 60.3°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 1.2°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 notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 63.1°F on 2023, while the historical minimum was 59.7°F on 2024.

latest data

last year

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest values recorded on those days in the past. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 60.1°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Katsuura

Date	Current Year actual* / forecast**	last year	10 years average
Mar 14	59.3°F	60.9°F	60.0°F
Mar 15	60.6°F	60.4°F	60.0°F
Mar 16	60.6°F	60.6°F	60.0°F
Mar 17	59.4°F	60.7°F	60.2°F
Mar 18	58.6°F	60.3°F	60.2°F
Mar 19	58.9°F	60.4°F	60.2°F
Mar 20	58.9°F	59.6°F	60.8°F
Mar 21	58.5°F	59.8°F	60.6°F
Mar 22	59.0°F	60.1°F	61.1°F
Mar 23	59.3°F	59.7°F	61.2°F
Mar 24	58.1°F	58.9°F	61.1°F
Mar 25	59.3°F	58.9°F	61.2°F
Mar 26	59.8°F	60.1°F	61.4°F
Mar 27	60.2°F	60.0°F	61.5°F
Mar 28	60.3°F	62.2°F	61.6°F
Mar 29	60.2°F	61.8°F	61.5°F
Mar 30	60.3°F	61.6°F	61.5°F
Mar 31	60.3°F	61.6°F	61.5°F
Apr 1	59.8°F	61.0°F	61.1°F
Apr 2	60.3°F	61.0°F	61.5°F
Apr 3	60.1°F	61.1°F	61.3°F
Apr 4	59.8°F	60.2°F	61.0°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 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	57.3°F	8mi
Kisarazu	57.1°F	27mi
Ichihara	57.1°F	29mi
Kimitsu	57.2°F	29mi
Futtsu	57.8°F	30mi
Chiba	57.2°F	33mi
Yokosuka	58.5°F	38mi
Yokohama	58.0°F	42mi
Kawasaki	57.3°F	42mi
Honchō	56.6°F	43mi

* current water temperature in this city

** straight line distance from Katsuura