Bayonne weather in September 2025

Expect 23°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Bayonne in September based on long-term weather averages. There is usually 12 days with some rainfall and 114 mm of average monthly rainfall in September.

  • 23°C maximum daytime temperature in September in Bayonne23
    23°C max day temperature
  • 7 hours of sunshine per day
  • 12 days with some rainfall in September in Bayonne12
    12 days with some rainfall
  • 14°C minimum night-time temperature in September in Bayonne14
    14°C min night temperature
  • 12 hours of daylight per day in September in Bayonne12
    12 hours of daylight per day
  • No heat & humidity in September in Bayonne0
    No heat & humidity
  • 114 mm monthly rainfall in September in Bayonne114
    114 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Bayonne5
    5 (Moderate) UV index
  • 20°C sea temperature in September in Bayonne20
    20°C sea temperature

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The September weather guide for France (Bayonne) 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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How hot is it in Bayonne in September?

Daytime temperatures usually reach 23°C in Bayonne in September, falling to 14°C at night.

How sunny is it in Bayonne in September?

There are normally 7 hours of bright sunshine each day in Bayonne in September - that's 52% of daylight hours.

How warm is the sea around Bayonne in September?

The average sea temperature around Bayonne in September is 20°C.

Does it rain in Bayonne in September?

There are usually 12 days with some rain in Bayonne in September and the average monthly rainfall is 114mm.

Bayonne September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:30 19:41
Monday, 15th September 2025 06:45 19:16
Tuesday, 30th September 2025 07:02 18:49

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