Current Sea Water Temperature:
+87.8°F
| Maximum Sea Water Temperature in July: | 89.6°F |
| Minimum Sea Water Temperature in July: | 73.0°F |
| Average water temperature in July: | 80.7°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| July 26 | 87.8°F | July 21 | 86.2°F |
| July 25 | 88.2°F | July 20 | 86.2°F |
| July 24 | 88.4°F | July 19 | 84.4°F |
| July 23 | 88.2°F | July 18 | 81.0°F |
| July 22 | 87.0°F | July 17 | 83.6°F |
When is the Warmest Sea for Hiroshima?
According to our data for the last three years for Hiroshima 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 Hiroshima was 86.9°F. The maximum and minimum values were 83.6°F and 88.8°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Hiroshima was 84.9°F. The maximum and minimum values were 80.6°F and 88.6°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2026 for Hiroshima was 81.7°F. The maximum and minimum values were 73.8°F and 88.4°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
Hiroshima
Local time: 09:35
27 jul, monday
| 1200 |  |
96°F | N 4 mph |
| 1500 | |
94°F | N 6 mph |
| 1800 |  |
90°F | NW 1 mph |
| 2100 |  |
80°F | SW 2 mph |
28 jul, tuesday
| 0000 | |
78°F | SW 1 mph |
| 0300 | |
76°F | SE 1 mph |
| 0600 |  |
78°F | SE 1 mph |
| 0900 | |
90°F | NE 3 mph |