Current Sea Water Temperature:
+90.4°F
| Maximum Sea Water Temperature in July: | 90.4°F |
| Minimum Sea Water Temperature in July: | 74.6°F |
| Average water temperature in July: | 82.3°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| July 26 | 90.4°F | July 21 | 87.8°F |
| July 25 | 90.2°F | July 20 | 84.6°F |
| July 24 | 88.6°F | July 19 | 86.2°F |
| July 23 | 88.6°F | July 18 | 85.4°F |
| July 22 | 87.0°F | July 17 | 84.0°F |
When is the Warmest Sea for Nagasaki?
According to our data for the last three years for Nagasaki the highest average sea water temperature was in August, September and July.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2025 for Nagasaki was 88.7°F. The maximum and minimum values were 86.6°F and 90.4°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Nagasaki was 87.7°F. The maximum and minimum values were 85.4°F and 89.2°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2026 for Nagasaki was 83.7°F. The maximum and minimum values were 78.0°F and 90.4°F respectively.
Japan Resorts:
NAME
F°
| Atami |  |
+80 |
| Fukuoka |  |
+92 |
| Hakone | |
+84 |
| Hiroshima |  |
+90 |
| Kamakura | |
+82 |
| Kobe | |
+90 |
| Kyoto | |
+92 |
| Nagasaki | |
+90 |
| Nagoya | |
+92 |
| Noboribetsu |  |
+66 |
| Okinawa | |
+88 |
| Osaka | |
+92 |
| Sapporo | |
+74 |
| Tokyo | |
+82 |
| Yokohama | |
+82 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Nagasaki
Local time: 08:43
27 jul, monday
| 0900 |  |
90°F | S 2 mph |
| 1200 | |
94°F | E 4 mph |
| 1500 | |
94°F | E 9 mph |
| 1800 | |
92°F | SE 8 mph |
| 2100 |  |
86°F | SE 5 mph |
28 jul, tuesday
| 0000 | |
84°F | S 4 mph |
| 0300 | |
84°F | SE 2 mph |
| 0600 | |
82°F | SE 2 mph |