Current Sea Water Temperature:
+70.4°F
| Maximum Sea Water Temperature in September: | 70.6°F |
| Minimum Sea Water Temperature in September: | 63.2°F |
| Average water temperature in September: | 66.5°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| September 08 | 70.4°F | September 03 | 69.4°F |
| September 07 | 70.6°F | September 02 | 69.4°F |
| September 06 | 70.0°F | September 01 | 69.6°F |
| September 05 | 70.0°F | August 31 | 70.0°F |
| September 04 | 69.8°F | August 30 | 71.2°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 70.9°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 |  |
+78 |
| Arcachon | |
+68 |
| Cannes | |
+78 |
| Corsica |  |
+78 |
| Deauville |  |
+58 |
| Etretat | |
+64 |
| Marseilles | |
+82 |
| Menton | |
+80 |
| Montpellier | |
+78 |
| Nice | |
+74 |
| Paris | |
+60 |
| Perpignan | |
+74 |
| Saint-Tropez | |
+82 |
| Toulon | |
+82 |
| Toulouse | |
+68 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Rennes
Local time: 02:26
09 sep, wednesday
| 0300 |  |
50°F | E 7 mph |
| 0600 | |
50°F | E 7 mph |
| 0900 |  |
54°F | E 7 mph |
| 1200 |  |
68°F | SE 9 mph |
| 1500 | |
68°F | SE 11 mph |
| 1800 |  |
68°F | S 11 mph |
| 2100 | |
58°F | SW 7 mph |
10 sep, thursday
| 0000 | |
52°F | S 5 mph |