Measurements:
°C
°F
CURRENT WEATHER
03:08
Rennes
50°F
E 7 mph
Feels like: 46°F
Precip: 12%
World Resorts France Rennes Weather

7 Day Weather Forecast

09.09
wed
DAY
68°F
SE 9 mph
precip
17%
NIGHT
52°F
S 5 mph
precip
23%
09.10
thu
DAY
66°F
N 2 mph
precip
11%
NIGHT
56°F
E 5 mph
precip
23%
09.11
fri
DAY
68°F
NE 6 mph
precip
22%
NIGHT
62°F
S 7 mph
precip
29%
09.12
sat
DAY
74°F
NE 4 mph
precip
11%
NIGHT
60°F
S 7 mph
precip
10%
09.13
sun
DAY
78°F
E 5 mph
precip
6%
NIGHT
68°F
S 6 mph
precip
24%
09.14
mon
DAY
78°F
S 6 mph
precip
4%
NIGHT
64°F
S 8 mph
precip
15%
09.15
tue
DAY
80°F
W 7 mph
precip
2%
NIGHT
72°F
W 5 mph
precip
3%

Rennes Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Rennes was 18.3°F. The maximum and minimum values were 17.1°F and 19.4°F respectively.

Rennes on the Weather Map

Best Time to Visit Rennes
The most sunny months:
July 13 days
August 12 days
September 11 days
The most warm months:
July 77.3 °F
August 77.2 °F
June 72.5 °F
Warmest sea temperature:
August 67.8 °F
September 66.5 °F
July 65.9 °F
The most cold months:
January 45.8 °F
February 48.0 °F
December 48.5 °F
The most rainy months:
June 5 days
November 3 days
April 3 days
The most windy months:
February 11 mph
December 11 mph
January 10 mph
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