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 15.9°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.

60.6

°F

March 15, 11:57

Trend:

stable

Yesterday:

60.4°F

Tomorrow:

60.4°F

Sunrise:

05:50

Sunset:

17:45

Day Length:

11 h. 55 min.

Isumi in March

Minimum:

58.8°F

Average:

62.7°F

Maximum:

66.8°F

Sea water temperature in Isumi today

As of now, in Isumi, the water temperature is 60.6°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 1.6°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to fall a bit.

Recent sea temperature and forecast

Today's water temperature is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 61.5°F on 2021, while the historical minimum was 57.0°F on 2015.

latest data

last year

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 61.0°F, with minimum temperature starting at 60.4°F, while the maximum might reach 61.7°F.

Daily water temperature in Isumi

Date	Current Year actual* / forecast**	last year	10 years average
Mar 1	59.0°F	60.5°F	59.1°F
Mar 2	59.6°F	60.7°F	59.4°F
Mar 3	59.2°F	62.3°F	59.6°F
Mar 4	59.1°F	62.6°F	59.7°F
Mar 5	59.3°F	62.5°F	59.6°F
Mar 6	59.4°F	62.4°F	59.4°F
Mar 7	59.0°F	62.1°F	59.3°F
Mar 8	58.1°F	62.1°F	59.4°F
Mar 9	61.1°F	63.4°F	60.0°F
Mar 10	60.7°F	63.5°F	59.8°F
Mar 11	60.5°F	62.2°F	60.0°F
Mar 12	59.9°F	62.2°F	59.6°F
Mar 13	60.0°F	59.9°F	59.3°F
Mar 14	60.4°F	59.5°F	58.8°F
Mar 15	60.6°F	60.4°F	59.1°F
Mar 16	60.4°F	59.8°F	58.8°F
Mar 17	60.7°F	59.4°F	59.2°F
Mar 18	60.8°F	59.4°F	59.2°F
Mar 19	60.7°F	59.4°F	59.1°F
Mar 20	61.7°F	58.7°F	60.1°F
Mar 21	61.2°F	58.1°F	59.6°F
Mar 22	61.6°F	57.3°F	60.0°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	60.9°F	8mi
Ichihara	55.1°F	27mi
Kisarazu	55.7°F	29mi
Chiba	55.0°F	30mi
Kimitsu	55.7°F	31mi
Futtsu	56.1°F	34mi
Honchō	54.1°F	40mi
Yokosuka	56.9°F	42mi
Kawasaki	54.5°F	44mi
Yokohama	55.3°F	45mi

* current water temperature in this city

** straight line distance from Isumi