What is the current water temperature in Katsuura?

As of now, in Katsuura, the water temperature is 26.23°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.

79.2

°F

September 18, 14:21

Trend:

decreasing

Yesterday:

79.4°F

Tomorrow:

78.9°F

Sunrise:

05:23

Sunset:

17:43

Day Length:

12 h. 20 min.

Katsuura in September

Minimum:

61.5°F

Average:

63.9°F

Maximum:

66.4°F

Sea water temperature in Katsuura today

As of now, in Katsuura, the water temperature is 79.2°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 0.5°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 closely matches the previous two weeks' average, indicating a stable 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 81.6°F on 2024, while the historical minimum was 75.8°F on 2019.

latest data

last year

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the histoorical minimum and others when it was close to the historical maximum. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 78.5°F, the minimum temperature may reach 78.1°F, and the maximum might stay at 79.0°F.

Daily water temperature in Katsuura

Date	Current Year actual* / forecast**	last year	10 years average
Sep 4	81.4°F	77.8°F	79.0°F
Sep 5	80.9°F	78.6°F	79.2°F
Sep 6	78.6°F	76.2°F	78.9°F
Sep 7	77.5°F	77.2°F	78.9°F
Sep 8	78.7°F	78.6°F	79.3°F
Sep 9	79.2°F	79.1°F	79.3°F
Sep 10	79.7°F	81.3°F	79.0°F
Sep 11	80.5°F	80.5°F	79.2°F
Sep 12	79.8°F	80.9°F	79.2°F
Sep 13	80.0°F	82.1°F	79.3°F
Sep 14	79.4°F	82.6°F	79.4°F
Sep 15	77.8°F	83.1°F	79.1°F
Sep 16	78.1°F	83.3°F	79.1°F
Sep 17	79.4°F	81.9°F	78.9°F
Sep 18	79.2°F	81.6°F	78.7°F
Sep 19	78.9°F	80.3°F	78.3°F
Sep 20	79.0°F	82.6°F	78.5°F
Sep 21	78.8°F	81.1°F	78.2°F
Sep 22	78.2°F	80.4°F	77.7°F
Sep 23	78.1°F	79.5°F	77.6°F
Sep 24	78.3°F	79.0°F	77.8°F
Sep 25	78.2°F	78.2°F	77.6°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	79.0°F	8mi
Kisarazu	81.1°F	27mi
Ichihara	83.3°F	29mi
Kimitsu	81.5°F	29mi
Futtsu	81.1°F	30mi
Chiba	83.2°F	33mi
Yokosuka	81.0°F	38mi
Yokohama	81.8°F	42mi
Kawasaki	82.7°F	42mi
Honchō	83.0°F	43mi

* current water temperature in this city

** straight line distance from Katsuura