Rennes weather
Our guide to the weather in Rennes during September
We've looked at the most up-to-date weather data for Rennes, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Rennes weather in September.
How warm is it in Rennes during September?
The temperature reaches around 22℃ during the daytime in September, falling away to 11℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.
Does it rain in Rennes during September?
September is typically the driest month in Rennes. On average, there will be 3 rainy days during the month, amounting to 34.0mm in total. That's much drier than we see in England during August, and therefore not something to be concerned about. There's a small chance that you'll catch a thunderstorm during your trip.
Is it windy in Rennes during September?
You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in September. With moderate air temperatures, any breeze will feel cool.
How warm is the sea in Rennes during September?
The water around Rennes is around 17℃ during September. It will feel a little on the cool when first entering, but you'll warm up quickly. Most kids will have no problem with this temperature, but those who feel the cold are unlikely to want to swim.
Weather in Rennes
Our month-by-month guide to the weather and climate in Rennes
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