Current sea water temperature:
+67.1°F
| Minimum sea water temperature in September: | 68.5°F |
| Maximum sea water temperature in September: | 61.9°F |
| Average sea water temperature in September: | 64.9°F |
| more information | |
14 days
forecast
forecast
| Rennes |
monthly
weather
weather
| Rennes |
Sea water temperature for the last 10 days:
| September 14 | 67.1°F | September 9 | 68.2°F |
| September 13 | 67.3°F | September 8 | 68.4°F |
| September 12 | 67.5°F | September 7 | 68.5°F |
| September 11 | 67.5°F | September 6 | 68.0°F |
| September 10 | 67.8°F | September 5 | 68.0°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:
2026
2025
2024
The average sea water temperature in August of 2026 was 68.8°F. The highest and lowest sea temperatures during the month were 70.2°F and 67.3°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:
2026
2025
2024
The average sea water temperature in July of 2026 was 67.2°F. The highest and lowest sea temperatures during the month were 68.9°F and 64.9°F.
current
weather
weather
| Rennes |
weather in
September
September
| Rennes |
Best time for vacation in Rennes
Rennes on a weather map
Places in France:
Name
°F
24 Hours Forecast
Rennes
Local time: 03:20
September 15, tuesday
0600
63°F
E
3 mph
3 mph
0900
64°F
E
4 mph
4 mph
1200
77°F
SE
8 mph
8 mph
1500
81°F
SE
11 mph
11 mph
1800
68°F
S
18 mph
18 mph
2100
59°F
SE
12 mph
12 mph
September 16, wednesday
0000
54°F
SE
8 mph
8 mph
0300
54°F
SE
7 mph
7 mph
