Rennes weather in September 2025

Expect 21°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Rennes in September. Check more long-term weather averages for Rennes in September before you book your next holiday to France in 2025/2026.

  • 21°C maximum daytime temperature in September in Rennes21
    21°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in Rennes13
    13 days with some rainfall
  • 11°C minimum night-time temperature in September in Rennes11
    11°C min night temperature
  • 13 hours of daylight per day in September in Rennes13
    13 hours of daylight per day
  • No heat & humidity in September in Rennes0
    No heat & humidity
  • 50 mm monthly rainfall in September in Rennes50
    50 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Rennes4
    4 (Moderate) UV index

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Rennes by month

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Recommended for France

  • Book early for skiing holidays in winter 2024/2025
  • Holiday prices frozen at winter 2023/2024 prices
  • FREE ski guiding & coaching included in holidays

The September weather guide for France (Rennes) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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More about France

How hot is it in Rennes in September?

Daytime temperatures usually reach 21°C in Rennes in September, falling to 11°C at night.

How sunny is it in Rennes in September?

There are normally 6 hours of bright sunshine each day in Rennes in September - that's 48% of daylight hours.

Does it rain in Rennes in September?

There are usually 13 days with some rain in Rennes in September and the average monthly rainfall is 50mm.

Rennes September sunrise & sunset times

Browse the sunrise and sunset times for Rennes in September 2025. Select a month to view Rennes sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:25 19:48
Monday, 15th September 2025 06:44 19:19
Tuesday, 30th September 2025 07:05 18:48

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