September · France
Best time to visit Rennes in September Weather, crowds & prices
Weather in Rennes in September
Average temperature 17°C, 66 mm of rain, about 9 days with 6+ hours of sunshine and 76% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
7.8/10
Ranked #6 of 12 months
- Avg temp
- 17°C
- Rainfall
- 66 mm
- Humidity
- 76%
- Days with 6h+ sun
- 9
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Rennes scores 7.8/10 for sightseeing and cultural travel - an above-average month (#6 of 12). Expect around 17°C, 66 mm of rain, and roughly 9 days with 6+ hours of sunshine this month.
Rennes mixes Breton half-timbered houses, a parliament square and one of France's liveliest student scenes.
September in Rennes: strong conditions, 6th of 12
Temperatures hover around 17°C (63°F) — the kind of month where neither heat nor cold forces the schedule.
Budget for roughly 66 mm of rain this month — a flexible day or two helps — with about 9 days with 6+ hours of sunshine and 12.3 hours of daylight to work around it.
That is 7.8/10 on the same scale — 6th of 12 months, versus 9.6/10 for the best month here.
Pack layers you can shed by midday plus one warm layer for the evening, a packable rain layer.
Budget for mid-season pricing, and crowds are moderate.
If your dates are flexible, July is materially better in Rennes — 1.8 points higher on the same scale.
Frequently asked
- What is the weather like in Rennes in September?
- In September, Rennes averages 17°C, 66 mm of rain, and about 9 days with 6+ hours of sunshine. Its climate-comfort score is 7.8/10.
- Is September a good time to visit Rennes?
- September earns a 7.8/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Rennes in September?
- Expect about 66 mm of rain in September. Average humidity is 76% and there are about 9 days with 6+ hours of sunshine.
Curated in Rennes
Tickets & experiences
Things to do in Rennes
Rennes, France. Live activities and tours from GetYourGuide, matched to this destination.