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 18.08°C. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it.

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.

64.5

°F

December 31, 17:21

Trend:

decreasing

Yesterday:

66.3°F

Tomorrow:

64.0°F

Sunrise:

06:47

Sunset:

16:36

Day Length:

9 h. 49 min.

Katsuura in January

Minimum:

59.7°F

Average:

64.3°F

Maximum:

67.7°F

Sea water temperature in Katsuura today

As of now, in Katsuura, the water temperature is 64.5°F. Swimming in water of this temperature is generally concidered to be cool, and most people won't really enjoy it. Today's reading is 0.3°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 also aligns closely with the historical average temperature for this date, indicating a typical climate pattern. The maximum temperature recorded for this date was 67.5°F on 2019, while the historical minimum was 60.4°F on 2021.

latest data

last year

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 63.7°F, the minimum temperature may reach 63.2°F, and the maximum might stay at 64.0°F.

Daily water temperature in Katsuura

Date	Current Year actual* / forecast**	last year	10 years average
Jan 1	64.0°F	62.5°F	64.3°F
Jan 2	64.0°F	61.9°F	64.3°F
Jan 3	63.5°F	61.4°F	63.8°F
Jan 4	63.7°F	62.5°F	64.0°F
Jan 5	63.8°F	63.4°F	64.0°F
Jan 6	63.4°F	61.6°F	63.6°F
Jan 7	63.2°F	63.3°F	63.4°F
Dec 17	70.4°F	66.1°F	66.5°F
Dec 18	70.0°F	66.3°F	66.3°F
Dec 19	69.0°F	65.3°F	65.8°F
Dec 20	67.7°F	64.9°F	65.7°F
Dec 21	67.5°F	64.9°F	65.3°F
Dec 22	67.6°F	63.4°F	65.4°F
Dec 23	67.1°F	62.4°F	65.2°F
Dec 24	66.6°F	65.9°F	65.3°F
Dec 25	66.4°F	66.8°F	65.1°F
Dec 26	66.0°F	65.8°F	65.4°F
Dec 27	67.0°F	64.4°F	65.5°F
Dec 28	67.7°F	62.9°F	65.3°F
Dec 29	68.5°F	63.4°F	65.7°F
Dec 30	66.3°F	63.3°F	64.9°F
Dec 31	64.5°F	63.1°F	64.8°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 115 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 63.4°F in Winter, 62.8°F in Spring, 74.8°F in Summer, and 74.9°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Isumi	63.1°F	8mi
Kisarazu	56.5°F	27mi
Ichihara	53.3°F	29mi
Kimitsu	56.7°F	29mi
Futtsu	58.3°F	30mi
Chiba	52.6°F	33mi
Yokosuka	60.9°F	38mi
Yokohama	57.0°F	42mi
Kawasaki	54.7°F	42mi
Honchō	51.2°F	43mi

* current water temperature in this city

** straight line distance from Katsuura