Brittany weather in September 2025

Expect 19°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Brittany in September. Check more long-term weather averages for Brittany in September before you book your next holiday to Brittany in 2025/2026.

  • 19°C maximum daytime temperature in September in Brittany (Brest)19
    19°C max day temperature
  • 6 hours of sunshine per day
  • 15 days with some rainfall in September in Brittany (Brest)15
    15 days with some rainfall
  • 12°C minimum night-time temperature in September in Brittany (Brest)12
    12°C min night temperature
  • 13 hours of daylight per day in September in Brittany (Brest)13
    13 hours of daylight per day
  • No heat & humidity in September in Brittany (Brest)0
    No heat & humidity
  • 88 mm monthly rainfall in September in Brittany (Brest)88
    88 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Brittany (Brest)4
    4 (Moderate) UV index
  • 16°C sea temperature in September in Brittany (Brest)16
    16°C sea temperature

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The September weather guide for Brittany (Brest) 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.

Top Brittany destinations

Below are average maximum temperatures at popular countries, regions and places in Brittany in September. Select a holiday destination to see more weather parameters.

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

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How hot is it in Brittany in September?

Daytime temperatures usually reach 19°C in Brest, Brittany in September, falling to 12°C at night.

How sunny is it in Brittany in September?

There are normally 6 hours of bright sunshine each day in Brest, Brittany in September - that's 44% of daylight hours.

How warm is the sea around Brittany in September?

The average sea temperature around Brest, Brittany in September is 16°C.

Does it rain in Brittany in September?

There are usually 15 days with some rain in Brest, Brittany in September and the average monthly rainfall is 88mm.

Brittany September sunrise & sunset times

Browse the sunrise and sunset times for Brittany in September 2025. Select a month to view Brittany sunrise and sunset times for the next 12 months. The Brittany sunrise and sunset times shown below are for Brest.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:36 19:59
Monday, 15th September 2025 06:55 19:30
Tuesday, 30th September 2025 07:16 18:59

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