What is the current water temperature in Isumi?

Q: What is the current water temperature in Isumi?

As of now, in Isumi, the water temperature is 12.73°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 > Isumi

Water temperature in Isumi

Detailed information about the current water temperature in Isumi. 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.

54.9

°F

April 17, 15:39

Trend:

increasing

Yesterday:

54.8°F

Tomorrow:

55.2°F

Sunrise:

05:05

Sunset:

18:12

Day Length:

13 h. 7 min.

Isumi in April

Minimum:

58.8°F

Average:

62.4°F

Maximum:

66.6°F

Sea water temperature in Isumi today

As of now, in Isumi, the water temperature is 54.9°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 5.9°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 rise 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 is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 63.2°F on 2016, while the historical minimum was 59.1°F on 2023.

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 minimum recorded over the past years. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 55.8°F, with minimum temperature starting at 55.2°F, while the maximum might reach 56.4°F.

Daily water temperature in Isumi

Date	Current Year actual* / forecast**	last year	10 years average
Apr 3	60.0°F	59.7°F	60.4°F
Apr 4	59.8°F	59.8°F	60.2°F
Apr 5	59.2°F	59.6°F	60.3°F
Apr 6	60.5°F	60.0°F	60.4°F
Apr 7	60.2°F	60.3°F	60.6°F
Apr 8	58.8°F	60.9°F	60.3°F
Apr 9	58.4°F	59.7°F	60.2°F
Apr 10	59.8°F	59.3°F	60.4°F
Apr 11	60.0°F	59.6°F	60.4°F
Apr 12	59.3°F	60.1°F	60.5°F
Apr 13	59.0°F	60.0°F	60.5°F
Apr 14	59.4°F	58.4°F	60.3°F
Apr 15	56.6°F	59.9°F	60.2°F
Apr 16	54.8°F	60.2°F	60.7°F
Apr 17	54.9°F	61.5°F	60.8°F
Apr 18	55.2°F	61.8°F	61.1°F
Apr 19	55.4°F	63.8°F	61.3°F
Apr 20	55.7°F	62.1°F	61.6°F
Apr 21	55.7°F	62.4°F	61.6°F
Apr 22	56.2°F	62.8°F	62.1°F
Apr 23	56.3°F	63.0°F	62.3°F
Apr 24	56.4°F	63.2°F	62.4°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 Isumi by month

In Isumi, the months July through October offer comfortable swimming conditions, which amounts to 103 swimming days.

The warmest water in Isumi was recorded on August 17, 2024, reaching a 82.8°F. While the coldest temperature occurred on February 18, 2018, dipping to 56.0°F. The average readings by season are 62.1°F in Winter, 62.0°F in Spring, 74.0°F in Summer, and 73.9°F in Autumn.

Popular neighboring cities and resorts

City	Water temperature*	Distance**
Katsuura	56.7°F	8mi
Ichihara	61.8°F	27mi
Kisarazu	61.0°F	29mi
Chiba	61.3°F	30mi
Kimitsu	60.7°F	31mi
Futtsu	60.5°F	34mi
Honchō	61.6°F	40mi
Yokosuka	60.2°F	42mi
Kawasaki	61.1°F	44mi
Yokohama	61.2°F	45mi

* current water temperature in this city

** straight line distance from Isumi