Water temperature in Isumi
74.4
°F
July 21, 08:15
Trend:
increasingYesterday:
74.3°FTomorrow:
74.9°F
Sunrise:
Sunset:
Day Length:
14 h. 12 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 74.4°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 1.2°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 slightly lower than the average registered over the last two weeks, indicating a slight cooling trend. It also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 77.9°F on 2025, while the historical minimum was 73.0°F on 2020.
Daily water temperature in Isumi
| Date |
Current Year
actual* / forecast** |
last year | 10 years average |
|---|---|---|---|
| Jul 7 | 70.8°F | 77.0°F | 73.0°F |
| Jul 8 | 72.6°F | 76.0°F | 73.4°F |
| Jul 9 | 74.6°F | 77.1°F | 73.8°F |
| Jul 10 | 75.1°F | 76.9°F | 73.5°F |
| Jul 11 | 73.9°F | 77.1°F | 73.9°F |
| Jul 12 | 74.5°F | 77.5°F | 74.0°F |
| Jul 13 | 74.8°F | 79.9°F | 74.5°F |
| Jul 14 | 77.4°F | 79.1°F | 74.9°F |
| Jul 15 | 77.6°F | 78.2°F | 75.0°F |
| Jul 16 | 74.6°F | 78.0°F | 74.8°F |
| Jul 17 | 77.2°F | 75.8°F | 74.9°F |
| Jul 18 | 76.4°F | 77.6°F | 75.2°F |
| Jul 19 | 76.3°F | 78.1°F | 75.3°F |
| Jul 20 | 74.3°F | 79.9°F | 75.5°F |
| Jul 21 | 74.4°F | 77.9°F | 75.6°F |
| Jul 22 | 74.9°F | 78.0°F | 76.1°F |
| Jul 23 | 74.8°F | 79.6°F | 76.0°F |
| Jul 24 | 75.1°F | 79.4°F | 76.3°F |
| Jul 25 | 75.5°F | 79.1°F | 76.7°F |
| Jul 26 | 75.2°F | 77.5°F | 76.4°F |
| Jul 27 | 75.2°F | 75.5°F | 76.4°F |
| Jul 28 | 75.1°F | 77.3°F | 76.3°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 |
76.9°F
|
8mi |
| Ichihara |
83.5°F
|
27mi |
| Kisarazu |
82.1°F
|
29mi |
| Chiba |
82.9°F
|
30mi |
| Kimitsu |
81.6°F
|
31mi |
| Futtsu |
80.5°F
|
34mi |
| Honchō |
81.9°F
|
40mi |
| Yokosuka |
78.4°F
|
42mi |
| Kawasaki |
81.9°F
|
44mi |
| Yokohama |
81.8°F
|
45mi |
* current water temperature in this city
** straight line distance from Isumi