All data are in degrees Fahrenheit

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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.
Sea temperature in Isumi now

59.2

°F

January 31, 08:30

Trend:

decreasing

Yesterday:

60.0°F

Tomorrow:

59.0°F

Sunrise:

06:39

Sunset:

17:05

Day Length:

10 h. 26 min.

Isumi in February

Minimum:

58.6°F

Average:

63.0°F

Maximum:

66.0°F

Sea water temperature in Isumi today

As of now, in Isumi, the water temperature is 59.2°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 1.4°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 slightly 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 64.8°F on 2017, while the historical minimum was 58.2°F on 2019.

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 58.6°F, the minimum temperature may reach 58.3°F, and the maximum might stay at 59.0°F.

Daily water temperature in Isumi

Date Current Year

actual* / forecast**

last year 10 years average
Jan 17 60.3°F 58.9°F 61.3°F
Jan 18 58.3°F 61.4°F 61.3°F
Jan 19 59.2°F 61.4°F 61.1°F
Jan 20 59.4°F 63.0°F 61.0°F
Jan 21 59.9°F 62.7°F 60.9°F
Jan 22 57.9°F 60.7°F 60.7°F
Jan 23 59.6°F 60.7°F 60.7°F
Jan 24 59.7°F 60.5°F 60.6°F
Jan 25 60.8°F 59.1°F 60.3°F
Jan 26 59.1°F 61.6°F 60.5°F
Jan 27 58.3°F 61.0°F 60.5°F
Jan 28 62.6°F 61.4°F 60.8°F
Jan 29 62.5°F 61.4°F 61.0°F
Jan 30 60.0°F 62.0°F 61.3°F
Jan 31 59.2°F 60.5°F 60.5°F
Feb 1 59.0°F 62.5°F 60.4°F
Feb 2 58.8°F 62.3°F 60.2°F
Feb 3 58.6°F 61.7°F 60.0°F
Feb 4 58.6°F 61.7°F 60.0°F
Feb 5 58.7°F 62.1°F 60.1°F
Feb 6 58.4°F 61.9°F 59.8°F
Feb 7 58.3°F 62.1°F 59.6°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 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 59.4°F 8mi
Ichihara 52.7°F 27mi
Kisarazu 54.2°F 29mi
Chiba 52.0°F 30mi
Kimitsu 54.3°F 31mi
Futtsu 55.4°F 34mi
Honchō 47.8°F 40mi
Yokosuka 56.9°F 42mi
Kawasaki 53.8°F 44mi
Yokohama 55.0°F 45mi

* current water temperature in this city

** straight line distance from Isumi