In July warmest sea in Japan is usually observed in the following locations: Okinawa, Fukuoka, Nagasaki.
Table below shows the average sea water temperature for marine resorts of Japan in July for the last three years.
| Place name | July 2026 | July 2025 | July 2024 |
|---|---|---|---|
| Okinawa | 82.1°F | 84.3°F | 85.6°F |
| Fukuoka | 78.4°F | 81.6°F | 80.6°F |
| Nagasaki | 78.2°F | 83.4°F | 80.0°F |
| Nagoya | 78.0°F | 83.8°F | 82.7°F |
| Osaka | 77.3°F | 84.0°F | 82.4°F |
| Nara | 77.1°F | 84.3°F | 81.9°F |
| Kobe | 77.1°F | 81.9°F | 80.3°F |
| Hiroshima | 76.0°F | 81.6°F | 80.1°F |
| Kyoto | 75.9°F | 84.9°F | 80.3°F |
| Tokyo | 75.7°F | 81.6°F | 81.6°F |
| Hakone | 75.5°F | 80.0°F | 78.9°F |
| Kamakura | 75.4°F | 80.2°F | 79.7°F |
| Atami | 75.4°F | 80.0°F | 78.6°F |
| Yokohama | 75.2°F | 80.8°F | 81.1°F |
| Sapporo | 66.0°F | 73.1°F | 68.8°F |
| Noboribetsu | 62.5°F | 69.7°F | 68.5°F |
Charts below show average sea water temperature for Japan resorts with the warmest sea in July.
You can also check other months of the year to see sea temperature of Japan resorts at that time.
Places in Japan:
Name
°F
