The Japan resorts with the warmest sea water temperature in September are Okinawa, Nagoya and Nagasaki.
Below you can see a list of all popular Japan resorts and information about sea water temperature in September for the last two years.
| Resort Name | September 2023 | September 2022 | September 2021 |
|---|---|---|---|
| Okinawa | 88.5°F | 87.5°F | 88.3°F |
| Nagoya | 87.5°F | 85.0°F | 81.6°F |
| Nagasaki | 86.2°F | 84.2°F | 83.8°F |
| Osaka | 85.8°F | 83.9°F | 81.9°F |
| Nara | 85.7°F | 83.9°F | 81.6°F |
| Kobe | 85.6°F | 84.0°F | 81.6°F |
| Kyoto | 85.5°F | 83.9°F | 80.7°F |
| Tokyo | 85.0°F | 81.8°F | 81.4°F |
| Yokohama | 84.6°F | 81.3°F | 81.0°F |
| Fukuoka | 84.5°F | 82.1°F | 82.5°F |
| Atami | 84.0°F | 82.2°F | 81.0°F |
| Hakone | 83.9°F | 81.5°F | 80.7°F |
| Kamakura | 83.9°F | 80.9°F | 80.3°F |
| Hiroshima | 83.5°F | 82.3°F | 81.1°F |
| Sapporo | 77.0°F | 72.6°F | 72.3°F |
| Noboribetsu | 76.0°F | 70.9°F | 69.8°F |
Please see following sea water temperature averages charts for the warmest Japan resorts in September.
You can also get the same information for the every other month of the year when the average sea water temperature is greater then 70°F.
