The Japan resorts with the warmest sea water temperature in July are Kyoto, Nara and Okinawa.
Below you can see a list of all popular Japan resorts and information about sea water temperature in July for the last two years.
| Resort Name | July 2025 | July 2024 | July 2023 |
|---|---|---|---|
| Kyoto | 88.8°F | 83.7°F | 83.5°F |
| Nara | 88.1°F | 85.5°F | 83.8°F |
| Okinawa | 88.1°F | 89.6°F | 88.3°F |
| Osaka | 87.8°F | 86.0°F | 83.9°F |
| Nagoya | 87.6°F | 86.4°F | 84.8°F |
| Nagasaki | 87.1°F | 83.4°F | 83.3°F |
| Kobe | 85.5°F | 83.7°F | 81.9°F |
| Fukuoka | 85.1°F | 84.0°F | 83.2°F |
| Tokyo | 85.1°F | 85.1°F | 84.2°F |
| Hiroshima | 85.1°F | 83.5°F | 80.6°F |
| Yokohama | 84.3°F | 84.5°F | 82.9°F |
| Kamakura | 83.6°F | 83.0°F | 81.1°F |
| Hakone | 83.4°F | 82.1°F | 80.1°F |
| Atami | 83.3°F | 81.8°F | 79.9°F |
| Sapporo | 75.6°F | 70.9°F | 73.6°F |
| Noboribetsu | 71.9°F | 70.6°F | 70.1°F |
Please see following sea water temperature averages charts for the warmest Japan resorts in July.
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.
