Water temperature in Isumi
71.0
°F
July 7, 03:46
Trend:
increasingYesterday:
70.7°FTomorrow:
71.2°F
Sunrise:
Sunset:
Day Length:
14 h. 26 min.Isumi in July
Minimum:
58.8°FAverage:
62.3°FMaximum:
66.0°FSea water temperature in Isumi today
As of now, in Isumi, the water temperature is 71.0°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 2.2°F lower 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 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 77.0°F on 2025, while the historical minimum was 70.3°F on 2022.
Daily water temperature in Isumi
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| Jun 23 | 71.7°F | 72.6°F | 70.5°F |
| Jun 24 | 72.1°F | 72.5°F | 70.9°F |
| Jun 25 | 72.8°F | 73.5°F | 70.5°F |
| Jun 26 | 73.0°F | 74.2°F | 71.3°F |
| Jun 27 | 73.0°F | 73.8°F | 71.2°F |
| Jun 28 | 72.4°F | 73.9°F | 71.5°F |
| Jun 29 | 72.5°F | 72.5°F | 71.8°F |
| Jun 30 | 71.4°F | 71.5°F | 71.5°F |
| Jul 1 | 71.3°F | 73.2°F | 71.9°F |
| Jul 2 | 71.9°F | 74.6°F | 71.8°F |
| Jul 3 | 71.8°F | 72.9°F | 72.2°F |
| Jul 4 | 71.2°F | 73.8°F | 72.2°F |
| Jul 5 | 71.6°F | 72.5°F | 72.4°F |
| Jul 6 | 70.7°F | 73.3°F | 72.9°F |
| Jul 7 | 71.0°F | 77.0°F | 73.2°F |
| Jul 8 | 71.2°F | 76.0°F | 73.5°F |
| Jul 9 | 71.5°F | 77.1°F | 73.7°F |
| Jul 10 | 71.2°F | 76.9°F | 73.4°F |
| Jul 11 | 71.6°F | 77.1°F | 73.9°F |
| Jul 12 | 71.7°F | 77.5°F | 74.0°F |
| Jul 13 | 72.2°F | 79.9°F | 74.4°F |
| Jul 14 | 72.4°F | 79.1°F | 74.7°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.
Popular neighboring cities and resorts
| City | Water temperature* | Distance** |
|---|---|---|
| Katsuura |
73.5°F
|
8mi |
| Ichihara |
74.9°F
|
27mi |
| Kisarazu |
74.3°F
|
29mi |
| Chiba |
75.0°F
|
30mi |
| Kimitsu |
74.3°F
|
31mi |
| Futtsu |
74.0°F
|
34mi |
| Honchō |
75.4°F
|
40mi |
| Yokosuka |
73.9°F
|
42mi |
| Kawasaki |
74.8°F
|
44mi |
| Yokohama |
74.5°F
|
45mi |
* current water temperature in this city
** straight line distance from Isumi