15.09
tue
tue
Day
77°F
SE 8 mph
Precip.
3%
3%
Night
54°F
SE 8 mph
Precip.
15%
15%
16.09
wed
wed
Day
66°F
SE 9 mph
Precip.
9%
9%
Night
52°F
SE 7 mph
Precip.
14%
14%
17.09
thu
thu
Day
66°F
NE 12 mph
Precip.
12%
12%
Night
54°F
SE 7 mph
Precip.
31%
31%
18.09
fri
fri
Day
64°F
SE 7 mph
Precip.
10%
10%
Night
52°F
S 4 mph
Precip.
12%
12%
19.09
sat
sat
Day
66°F
NE 9 mph
Precip.
7%
7%
Night
59°F
S 6 mph
Precip.
15%
15%
20.09
sun
sun
Day
68°F
S 6 mph
Precip.
4%
4%
Night
59°F
S 8 mph
Precip.
20%
20%
21.09
mon
mon
Day
72°F
SW 8 mph
Precip.
3%
3%
Night
63°F
SW 8 mph
Precip.
20%
20%
22.09
tue
tue
Day
75°F
W 9 mph
Precip.
8%
8%
Night
64°F
SW 8 mph
Precip.
7%
7%
23.09
wed
wed
Day
79°F
W 11 mph
Precip.
2%
2%
Night
66°F
SW 7 mph
Precip.
2%
2%
24.09
thu
thu
Day
79°F
W 11 mph
Precip.
1%
1%
Night
66°F
SW 6 mph
Precip.
1%
1%
25.09
fri
fri
Day
79°F
W 8 mph
Precip.
1%
1%
Night
66°F
SW 6 mph
Precip.
1%
1%
26.09
sat
sat
Day
81°F
NW 6 mph
Precip.
1%
1%
Night
66°F
NE 4 mph
Precip.
2%
2%
27.09
sun
sun
Day
81°F
N 7 mph
Precip.
1%
1%
Night
63°F
NE 5 mph
Precip.
12%
12%
28.09
mon
mon
Day
79°F
N 7 mph
Precip.
7%
7%
Night
66°F
N 4 mph
Precip.
38%
38%
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.
Air temperature in Rennes, °F
Precipitation total in Rennes, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Rennes
Rennes on a weather map
Places in France:
Name
°F
24 Hours Forecast
Rennes
Local time: 03:06
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
