Current Sea Water Temperature:
+64.0°F
| Maximum Sea Water Temperature in May: | 65.2°F |
| Minimum Sea Water Temperature in May: | 50.0°F |
| Average water temperature in May: | 55.9°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| May 30 | 64.0°F | May 25 | 62.4°F |
| May 29 | 64.0°F | May 24 | 61.2°F |
| May 28 | 65.2°F | May 23 | 59.6°F |
| May 27 | 64.8°F | May 22 | 59.0°F |
| May 26 | 63.2°F | May 21 | 57.4°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 2025 for Rennes was 67.4°F. The maximum and minimum values were 65.2°F and 68.6°F respectively.
France Resorts:
NAME
F°
| Antibes |  |
+80 |
| Arcachon |  |
+70 |
| Biarritz |  |
+68 |
| Bordeaux | |
+80 |
| Cannes | |
+80 |
| Corsica | |
+80 |
| Etretat | |
+66 |
| Marseilles | |
+82 |
| Menton | |
+76 |
| Montpellier | |
+82 |
| Nice | |
+80 |
| Paris | |
+88 |
| Perpignan | |
+84 |
| Saint-Tropez | |
+82 |
| Toulouse | |
+78 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Rennes
Local time: 11:34
30 may, saturday
| 1200 |  |
80°F | SE 3 mph |
| 1500 | |
86°F | E 5 mph |
| 1800 |  |
76°F | SE 16 mph |
| 2100 |  |
64°F | S 12 mph |
31 may, sunday
| 0000 |  |
56°F | SE 9 mph |
| 0300 |  |
54°F | SE 7 mph |
| 0600 | |
52°F | SE 6 mph |
| 0900 | |
60°F | E 6 mph |