Current Sea Water Temperature:
+71.8°F
| Maximum Sea Water Temperature in August: | 72.4°F |
| Minimum Sea Water Temperature in August: | 64.6°F |
| Average water temperature in August: | 67.8°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| August 19 | 71.8°F | August 14 | 72.0°F |
| August 18 | 72.2°F | August 13 | 71.6°F |
| August 17 | 72.2°F | August 12 | 70.6°F |
| August 16 | 71.8°F | August 11 | 69.2°F |
| August 15 | 72.4°F | August 10 | 70.4°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 2026 for Rennes was 71.0°F. The maximum and minimum values were 69.2°F and 72.4°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 69.1°F. The maximum and minimum values were 66.6°F and 71.0°F respectively.
France Resorts:
NAME
F°
| Antibes |  |
+84 |
| Arcachon |  |
+72 |
| Cannes | |
+84 |
| Corsica |  |
+84 |
| Deauville | |
+62 |
| Etretat |  |
+68 |
| Marseilles | |
+84 |
| Menton | |
+84 |
| Montpellier | |
+84 |
| Nice |  |
+80 |
| Paris | |
+72 |
| Perpignan | |
+88 |
| Saint-Tropez | |
+86 |
| Toulon | |
+84 |
| Toulouse | |
+86 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Rennes
Local time: 20:11
19 aug, wednesday
| 2100 |  |
66°F | SE 5 mph |
20 aug, thursday
| 0000 |  |
60°F | SE 4 mph |
| 0300 |  |
58°F | E 6 mph |
| 0600 |  |
54°F | NE 7 mph |
| 0900 | |
60°F | NE 9 mph |
| 1200 | |
74°F | E 12 mph |
| 1500 | |
82°F | E 14 mph |
| 1800 | |
80°F | E 10 mph |