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 19.66°C. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool.

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.

67.4

°F

December 21, 04:29

Trend:

stable

Yesterday:

67.7°F

Tomorrow:

67.4°F

Sunrise:

06:43

Sunset:

16:30

Day Length:

9 h. 47 min.

Katsuura in December

Minimum:

59.6°F

Average:

63.3°F

Maximum:

66.9°F

Sea water temperature in Katsuura today

As of now, in Katsuura, the water temperature is 67.4°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 2.3°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 stay about the same.

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 is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 68.3°F on 2015, while the historical minimum was 62.6°F on 2023.

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. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 67.4°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
Dec 7	69.4°F	67.8°F	67.5°F
Dec 8	70.2°F	67.9°F	67.4°F
Dec 9	71.0°F	66.8°F	67.5°F
Dec 10	69.8°F	67.3°F	67.4°F
Dec 11	69.5°F	66.7°F	67.3°F
Dec 12	68.2°F	68.0°F	67.1°F
Dec 13	68.3°F	68.6°F	67.2°F
Dec 14	68.2°F	67.5°F	66.8°F
Dec 15	67.3°F	66.2°F	66.0°F
Dec 16	69.4°F	66.9°F	66.6°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	65.4°F
Dec 21	67.4°F	64.9°F	65.1°F
Dec 22	67.4°F	63.4°F	65.2°F
Dec 23	67.2°F	62.4°F	65.0°F
Dec 24	67.5°F	65.9°F	65.2°F
Dec 25	67.2°F	66.8°F	64.9°F
Dec 26	67.6°F	65.8°F	65.3°F
Dec 27	67.6°F	64.4°F	65.4°F
Dec 28	67.4°F	62.9°F	65.1°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 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 63.3°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	65.9°F	8mi
Kisarazu	57.1°F	27mi
Ichihara	55.0°F	29mi
Kimitsu	57.1°F	29mi
Futtsu	59.8°F	30mi
Chiba	54.9°F	33mi
Yokosuka	62.9°F	38mi
Yokohama	56.2°F	42mi
Kawasaki	55.2°F	42mi
Honchō	53.9°F	43mi

* current water temperature in this city

** straight line distance from Katsuura