Current Sea Water Temperature:
+70.4°F
| Maximum Sea Water Temperature in July: | 71.0°F |
| Minimum Sea Water Temperature in July: | 60.4°F |
| Average water temperature in July: | 65.9°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| July 30 | 70.4°F | July 25 | 70.2°F |
| July 29 | 70.2°F | July 24 | 69.2°F |
| July 28 | 69.4°F | July 23 | 68.4°F |
| July 27 | 70.0°F | July 22 | 67.2°F |
| July 26 | 71.0°F | July 21 | 67.4°F |
When is the Warmest Sea for Rennes?
According to our data for the last three years for Rennes 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 Rennes was 69.2°F. The maximum and minimum values were 67.4°F and 70.2°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Rennes was 66.6°F. The maximum and minimum values were 64.2°F and 68.8°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2026 for Rennes was 69.0°F. The maximum and minimum values were 66.6°F and 71.0°F respectively.
France Resorts:
NAME
F°
| Antibes |  |
+90 |
| Arcachon |  |
+80 |
| Cannes | |
+92 |
| Corsica | |
+92 |
| Deauville | |
+76 |
| Etretat |  |
+70 |
| Marseilles | |
+88 |
| Menton | |
+88 |
| Montpellier | |
+88 |
| Nice | |
+92 |
| Paris | |
+92 |
| Perpignan | |
+92 |
| Saint-Tropez | |
+92 |
| Toulon | |
+92 |
| Toulouse | |
+100 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Rennes
Local time: 14:58
30 jul, thursday
| 1500 |  |
90°F | SE 7 mph |
| 1800 | |
90°F | S 10 mph |
| 2100 | |
72°F | S 13 mph |
31 jul, friday
| 0000 |  |
64°F | S 11 mph |
| 0300 | |
60°F | SE 7 mph |
| 0600 | |
56°F | SE 7 mph |
| 0900 |  |
66°F | S 10 mph |
| 1200 | |
78°F | SE 9 mph |