Isumi in September
Find out everything about the water temperature in Isumi in September. Average, minimum and maximum recorded temperatures as well as daily temperature in September for the last two years. Compare the current month's sea temperature data with other months of the year.
Water temperature in September
Minimum:
72.9 °F
Average:
77.8 °F
Maximum:
81.4 °F
Sea water temperature in Isumi in September
In the city of Isumi, the month of September is a great time for swimming. The minimum recorded temperature during this month was 72.9°F on September 25, 2023, with an average temperature being 77.8°F and a maximum temperature reaching 81.4°F on September 7, 2020.
| Date | 10 years average | 2024 | 2023 |
|---|---|---|---|
| Sep 1 | 78.4°F | 78.8°F | 78.2°F |
| Sep 2 | 78.4°F | 79.0°F | 77.7°F |
| Sep 3 | 78.3°F | 78.7°F | 77.1°F |
| Sep 4 | 78.1°F | 77.1°F | 77.3°F |
| Sep 5 | 78.1°F | 77.5°F | 79.4°F |
| Sep 6 | 78.3°F | 76.6°F | 79.5°F |
| Sep 7 | 78.6°F | 77.6°F | 79.3°F |
| Sep 8 | 78.4°F | 77.7°F | 78.9°F |
| Sep 9 | 78.1°F | 77.7°F | 79.3°F |
| Sep 10 | 78.1°F | 79.4°F | 77.1°F |
| Sep 11 | 78.3°F | 80.2°F | 77.8°F |
| Sep 12 | 78.3°F | 79.3°F | 78.0°F |
| Sep 13 | 78.2°F | 79.1°F | 78.0°F |
| Sep 14 | 78.4°F | 79.1°F | 80.3°F |
| Sep 15 | 78.2°F | 78.7°F | 79.9°F |
| Sep 16 | 78.1°F | 78.3°F | 79.8°F |
| Sep 17 | 78.2°F | 81.0°F | 80.6°F |
| Sep 18 | 77.9°F | 80.2°F | 79.2°F |
| Sep 19 | 77.7°F | 79.3°F | 78.5°F |
| Sep 20 | 77.8°F | 81.2°F | 77.3°F |
| Sep 21 | 77.5°F | 80.4°F | 77.3°F |
| Sep 22 | 77.0°F | 80.0°F | 76.7°F |
| Sep 23 | 76.9°F | 78.5°F | 76.6°F |
| Sep 24 | 77.0°F | 78.0°F | 76.5°F |
| Sep 25 | 76.7°F | 77.1°F | 72.9°F |
| Sep 26 | 76.7°F | 76.6°F | 74.6°F |
| Sep 27 | 76.9°F | 76.6°F | 75.8°F |
| Sep 28 | 76.6°F | 76.6°F | 77.4°F |
| Sep 29 | 76.7°F | 76.4°F | 77.5°F |
| Sep 30 | 76.7°F | 76.3°F | 78.2°F |
In Isumi, the months July through October offer comfortable swimming conditions, which amounts to 102 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 62.0°F in Winter, 62.0°F in Spring, 74.0°F in Summer, and 73.8°F in Autumn.
September's average temperature is a slight drop from August's average of 78.5°F. In October, the temperature is expected to decrease further, potentially averaging around 74.1°F.
Popular neighboring cities and resorts
| City | Water temperature* | Distance** |
|---|---|---|
| Katsuura |
63.4°F
|
8mi |
| Ichihara |
56.3°F
|
27mi |
| Kisarazu |
59.0°F
|
29mi |
| Chiba |
56.1°F
|
30mi |
| Kimitsu |
58.9°F
|
31mi |
| Futtsu |
59.8°F
|
34mi |
| Honchō |
55.7°F
|
40mi |
| Yokosuka |
60.9°F
|
42mi |
| Kawasaki |
58.0°F
|
44mi |
| Yokohama |
59.6°F
|
45mi |
* current water temperature in this city
** straight line distance from Isumi