What is the current water temperature in Katsuura?

As of now, in Katsuura, the water temperature is 27.41°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.

81.3

°F

September 5, 19:19

Trend:

decreasing

Yesterday:

81.5°F

Tomorrow:

80.9°F

Sunrise:

05:14

Sunset:

18:01

Day Length:

12 h. 47 min.

Katsuura in September

Minimum:

61.5°F

Average:

64.0°F

Maximum:

66.4°F

Sea water temperature in Katsuura today

As of now, in Katsuura, the water temperature is 81.3°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 2.0°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 fall a bit.

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 maximum temperature for this date. The maximum temperature recorded for this date was 81.7°F on 2020, while the historical minimum was 76.9°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. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 81.1°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
Aug 22	81.7°F	78.8°F	79.4°F
Aug 23	82.1°F	80.1°F	80.0°F
Aug 24	82.3°F	79.8°F	79.8°F
Aug 25	81.9°F	78.9°F	79.3°F
Aug 26	81.7°F	79.7°F	80.1°F
Aug 27	80.7°F	79.0°F	80.0°F
Aug 28	82.3°F	78.5°F	79.9°F
Aug 29	81.1°F	78.2°F	79.9°F
Aug 30	81.1°F	78.8°F	79.7°F
Aug 31	80.8°F	79.8°F	79.7°F
Sep 1	81.2°F	81.0°F	79.5°F
Sep 2	80.9°F	81.1°F	79.5°F
Sep 3	82.9°F	81.9°F	79.3°F
Sep 4	81.5°F	81.4°F	79.2°F
Sep 5	81.3°F	80.9°F	79.4°F
Sep 6	80.9°F	78.6°F	78.9°F
Sep 7	80.9°F	77.5°F	78.9°F
Sep 8	81.3°F	78.7°F	79.3°F
Sep 9	81.4°F	79.2°F	79.4°F
Sep 10	81.0°F	79.7°F	79.0°F
Sep 11	81.2°F	80.5°F	79.2°F
Sep 12	81.2°F	79.8°F	79.2°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, 75.0°F in Summer, and 75.1°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Isumi	80.6°F	8mi
Kisarazu	80.8°F	27mi
Ichihara	81.2°F	29mi
Kimitsu	80.7°F	29mi
Futtsu	80.2°F	30mi
Chiba	81.1°F	33mi
Yokosuka	80.0°F	38mi
Yokohama	80.5°F	42mi
Kawasaki	80.9°F	42mi
Honchō	81.1°F	43mi

* current water temperature in this city

** straight line distance from Katsuura