Current Sea Water Temperature:
+57.4°F
| Maximum Sea Water Temperature in May: | 61.0°F |
| Minimum Sea Water Temperature in May: | 50.0°F |
| Average water temperature in May: | 55.8°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| May 09 | 57.4°F | May 04 | 56.6°F |
| May 08 | 56.6°F | May 03 | 56.4°F |
| May 07 | 56.4°F | May 02 | 56.4°F |
| May 06 | 56.4°F | May 01 | 56.4°F |
| May 05 | 57.0°F | April 30 | 56.2°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 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°
| Annecy |  |
+48 |
| Antibes | |
+66 |
| Biarritz |  |
+58 |
| Bordeaux | |
+58 |
| Cannes | |
+64 |
| Corsica |  |
+58 |
| Etretat | |
+56 |
| Marseilles | |
+66 |
| Menton | |
+66 |
| Montpellier |  |
+58 |
| Nice | |
+64 |
| Paris | |
+56 |
| Perpignan | |
+58 |
| Saint-Tropez | |
+66 |
| Toulouse | |
+58 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Rennes
Local time: 04:02
10 may, sunday
| 0600 |  |
54°F | W 6 mph |
| 0900 |  |
58°F | SW 6 mph |
| 1200 | |
60°F | SW 9 mph |
| 1500 | |
60°F | SW 12 mph |
| 1800 | |
58°F | SW 11 mph |
| 2100 | |
52°F | SW 11 mph |
11 may, monday
| 0000 | |
50°F | SW 12 mph |
| 0300 | |
48°F | S 10 mph |