29.09
tue
tue
Day
68°F
N 10 mph
Precip.
24%
24%
Night
66°F
NW 7 mph
Precip.
21%
21%
30.09
wed
wed
Day
64°F
NE 7 mph
Precip.
16%
16%
Night
61°F
N 9 mph
Precip.
11%
11%
01.10
thu
thu
Day
63°F
E 6 mph
Precip.
5%
5%
Night
57°F
S 1 mph
Precip.
19%
19%
02.10
fri
fri
Day
63°F
W 5 mph
Precip.
13%
13%
Night
55°F
S 8 mph
Precip.
12%
12%
03.10
sat
sat
Day
66°F
SW 6 mph
Precip.
2%
2%
Night
55°F
S 7 mph
Precip.
12%
12%
04.10
sun
sun
Day
64°F
SE 6 mph
Precip.
8%
8%
Night
52°F
SE 6 mph
Precip.
23%
23%
05.10
mon
mon
Day
59°F
SW 9 mph
Precip.
17%
17%
Night
55°F
S 14 mph
Precip.
16%
16%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 67.2°F. The highest and lowest sea temperatures during the month were 68.5°F and 66.0°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 60.6°F. The highest and lowest sea temperatures during the month were 62.6°F and 57.9°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: 08:22
September 29, tuesday
0900
63°F
N
10 mph
10 mph
1200
68°F
N
10 mph
10 mph
1500
75°F
NW
17 mph
17 mph
1800
77°F
N
16 mph
16 mph
2100
66°F
N
9 mph
9 mph
September 30, wednesday
0000
66°F
NW
7 mph
7 mph
0300
72°F
N
16 mph
16 mph
0600
68°F
N
14 mph
14 mph
