Isumi in October
Find out everything about the water temperature in Isumi in October. Average, minimum and maximum recorded temperatures as well as daily temperature in October for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in October
Minimum:
69.4 °F
Average:
74.5 °F
Maximum:
78.1 °F
Sea water temperature in Isumi in October
In the city of Isumi, the month of October is a great time for swimming. The minimum recorded temperature during this month was 69.4°F on October 30, 2022, with an average temperature being 74.5°F and a maximum temperature reaching 78.1°F on October 6, 2023.
| Date | 10 years average | 2025 | 2024 |
|---|---|---|---|
| Oct 1 | 76.1°F | 75.3°F | 76.1°F |
| Oct 2 | 75.7°F | 75.6°F | 75.3°F |
| Oct 3 | 75.6°F | 75.3°F | 75.7°F |
| Oct 4 | 75.8°F | 75.3°F | 76.4°F |
| Oct 5 | 75.4°F | 75.5°F | 77.0°F |
| Oct 6 | 75.7°F | 76.3°F | 75.9°F |
| Oct 7 | 75.5°F | 75.1°F | 77.2°F |
| Oct 8 | 75.8°F | 75.1°F | 78.0°F |
| Oct 9 | 75.1°F | 75.0°F | 77.5°F |
| Oct 10 | 75.4°F | 76.0°F | 77.3°F |
| Oct 11 | 75.1°F | 76.0°F | 74.7°F |
| Oct 12 | 75.2°F | 75.9°F | 77.4°F |
| Oct 13 | 75.1°F | 75.9°F | 77.2°F |
| Oct 14 | 74.7°F | 75.0°F | 76.5°F |
| Oct 15 | 74.8°F | 75.2°F | 76.0°F |
| Oct 16 | 74.6°F | 75.3°F | 77.1°F |
| Oct 17 | 74.7°F | 77.0°F | 77.1°F |
| Oct 18 | 74.6°F | 76.5°F | 76.8°F |
| Oct 19 | 74.6°F | 77.6°F | 76.4°F |
| Oct 20 | 74.1°F | 77.0°F | 76.2°F |
| Oct 21 | 74.1°F | 76.5°F | 74.8°F |
| Oct 22 | 74.1°F | 76.0°F | 76.1°F |
| Oct 23 | 73.7°F | 75.6°F | 77.5°F |
| Oct 24 | 73.7°F | 76.4°F | 76.6°F |
| Oct 25 | 73.7°F | 76.2°F | 76.4°F |
| Oct 26 | 73.2°F | 75.8°F | 76.0°F |
| Oct 27 | 73.0°F | 74.0°F | 76.6°F |
| Oct 28 | 73.3°F | 75.6°F | 76.0°F |
| Oct 29 | 72.8°F | 75.2°F | 75.6°F |
| Oct 30 | 72.4°F | 74.0°F | 75.3°F |
| Oct 31 | 71.9°F | 73.7°F | 72.8°F |
In Isumi, the months July through October offer comfortable swimming conditions, which amounts to 109 swimming days.
The warmest water in Isumi was recorded on August 17, 2024, reaching a 82.8°F. While the coldest temperature occurred on April 20, 2025, dipping to 53.1°F. The average readings by season are 62.1°F in Winter, 61.8°F in Spring, 74.2°F in Summer, and 74.0°F in Autumn.
October's average temperature is a slight drop from September's average of 77.9°F. In November, the temperature is expected to decrease further, potentially averaging around 69.7°F.
Popular neighboring cities and resorts
| City | Water temperature* | Distance** |
|---|---|---|
| Katsuura |
61.1°F
|
8mi |
| Ichihara |
53.2°F
|
27mi |
| Kisarazu |
54.8°F
|
29mi |
| Chiba |
52.6°F
|
30mi |
| Kimitsu |
54.8°F
|
31mi |
| Futtsu |
55.5°F
|
34mi |
| Honchō |
50.1°F
|
40mi |
| Yokosuka |
57.8°F
|
42mi |
| Kawasaki |
53.5°F
|
44mi |
| Yokohama |
55.0°F
|
45mi |
* current water temperature in this city
** straight line distance from Isumi