Mild
Average highs are around 21°C, so days are mild rather than hot.
September verdict
Rennes, France in September
Weather score47Mixed
Mixed for holiday weather
Average highs are around 21°C, so days are mild rather than hot. Sunshine averages 5.9h per day, enough for a balanced month. Rainfall averages 50mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
21°C
Rain
50mm
Sun
5.9h
Sea
18°C
Weather score
47
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 50mm, which is relatively low for holiday planning.
Some sun
Sunshine averages 5.9h per day, enough for a balanced month.
Cool sea
Sea temperatures average 18°C, so the water can feel cool.
Map
Weather map
Compare Rennes, France with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September21°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September50mm average rain
September sits on the drier side of Rennes' year, which helps with sightseeing and transfers.
Driest monthsJanuary to October and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September5.9 hours average sun
September sits close to Rennes' yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September18°C average sea
September is one of Rennes' warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to September
Sea temperatures are usually near 18°C in this stretch, so swimming comfort is at its strongest.
Weather score
September47 weather score
September scores above Rennes' yearly average, so the overall weather mix is stronger than most months.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.