26.08
wed
wed
Day
75°F
N 7 mph
Precip.
13%
13%
Night
61°F
NW 11 mph
Precip.
58%
58%
27.08
thu
thu
Day
73°F
NE 9 mph
Precip.
14%
14%
Night
59°F
E 7 mph
Precip.
27%
27%
28.08
fri
fri
Day
72°F
NE 14 mph
Precip.
11%
11%
Night
61°F
E 12 mph
Precip.
11%
11%
29.08
sat
sat
Day
66°F
NE 17 mph
Precip.
19%
19%
Night
61°F
NE 9 mph
Precip.
34%
34%
30.08
sun
sun
Day
66°F
N 9 mph
Precip.
27%
27%
Night
61°F
NE 14 mph
Precip.
12%
12%
31.08
mon
mon
Day
70°F
E 10 mph
Precip.
5%
5%
Night
57°F
S 6 mph
Precip.
23%
23%
01.09
tue
tue
Day
70°F
E 3 mph
Precip.
2%
2%
Night
59°F
NE 9 mph
Precip.
27%
27%
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.
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: 03:34
August 26, wednesday
0600
61°F
N
6 mph
6 mph
0900
64°F
N
7 mph
7 mph
1200
75°F
N
7 mph
7 mph
1500
81°F
NW
14 mph
14 mph
1800
64°F
W
9 mph
9 mph
2100
63°F
W
9 mph
9 mph
August 27, thursday
0000
61°F
NW
11 mph
11 mph
0300
61°F
NW
7 mph
7 mph
