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 15.08°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.

59.1

°F

April 11, 04:27

Trend:

stable

Yesterday:

59.3°F

Tomorrow:

59.3°F

Sunrise:

05:13

Sunset:

18:08

Day Length:

12 h. 55 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 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 2.2°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 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 64.7°F on 2016, while the historical minimum was 59.6°F on 2019.

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 59.4°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 28	61.5°F	62.2°F	61.5°F
Mar 29	59.8°F	61.8°F	61.3°F
Mar 30	60.1°F	61.6°F	61.4°F
Mar 31	60.9°F	61.6°F	61.4°F
Apr 1	61.1°F	61.0°F	61.1°F
Apr 2	61.8°F	61.0°F	61.5°F
Apr 3	58.8°F	61.1°F	61.1°F
Apr 4	59.6°F	60.2°F	60.9°F
Apr 5	59.3°F	59.2°F	60.8°F
Apr 6	59.1°F	60.4°F	61.0°F
Apr 7	59.6°F	60.4°F	61.3°F
Apr 8	58.3°F	59.5°F	61.0°F
Apr 9	59.0°F	59.5°F	61.2°F
Apr 10	59.3°F	60.0°F	61.5°F
Apr 11	59.1°F	60.2°F	61.3°F
Apr 12	59.3°F	59.5°F	61.4°F
Apr 13	59.4°F	59.6°F	61.6°F
Apr 14	59.1°F	59.8°F	61.3°F
Apr 15	59.2°F	57.9°F	61.4°F
Apr 16	59.3°F	56.7°F	61.5°F
Apr 17	59.5°F	58.1°F	61.7°F
Apr 18	59.7°F	58.2°F	61.9°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	57.2°F	8mi
Kisarazu	59.3°F	27mi
Ichihara	59.6°F	29mi
Kimitsu	59.2°F	29mi
Futtsu	59.1°F	30mi
Chiba	59.4°F	33mi
Yokosuka	59.1°F	38mi
Yokohama	59.8°F	42mi
Kawasaki	59.8°F	42mi
Honchō	59.0°F	43mi

* current water temperature in this city

** straight line distance from Katsuura