Current sea water temperature:
+51.4°F
| Minimum sea water temperature in December: | 55.6°F |
| Maximum sea water temperature in December: | 48.9°F |
| Average sea water temperature in December: | 51.4°F |
| more information | |
14 days
forecast
forecast
| Rennes |
monthly
weather
weather
| Rennes |
Sea water temperature for the last 10 days:
| December 14 | 51.4°F | December 9 | 52.0°F |
| December 13 | 51.4°F | December 8 | 52.2°F |
| December 12 | 51.6°F | December 7 | 52.3°F |
| December 11 | 51.8°F | December 6 | 52.5°F |
| December 10 | 52.0°F | December 5 | 52.5°F |
Monthly sea water temperature, °F
When is the warmest sea in Rennes?
Based on the data about daily sea water temperature for the last three years the warmest sea in Rennes was noticed in August, September and July.
Monthly Sea Temperatures in Rennes, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 67.3°F. The highest and lowest sea temperatures during the month were 68.2°F and 65.7°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 64.9°F. The highest and lowest sea temperatures during the month were 66.9°F and 62.8°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 65.6°F. The highest and lowest sea temperatures during the month were 66.7°F and 63.7°F.
current
weather
weather
| Rennes |
weather in
December
December
| Rennes |
Best time for vacation in Rennes
Rennes on a weather map
Places in France:
Name
°F
24 Hours Forecast
Rennes
Local time: 03:22
December 15, monday
0600
48°F
N
15 mph
15 mph
0900
48°F
N
14 mph
14 mph
1200
52°F
N
15 mph
15 mph
1500
54°F
N
17 mph
17 mph
1800
52°F
N
15 mph
15 mph
2100
50°F
N
16 mph
16 mph
December 16, tuesday
0000
48°F
N
11 mph
11 mph
0300
50°F
N
9 mph
9 mph
