Saint-Nazaire weather in September 2025

Expect daytime maximum temperatures of 21°C in Saint-Nazaire in September based on long-term weather averages. There are 6 hours of sunshine per day on average with 13 days with some rainfall and typically 66 mm of rainfall in the month.

  • 21°C maximum daytime temperature in September in Saint-Nazaire21
    21°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in Saint-Nazaire13
    13 days with some rainfall
  • 12°C minimum night-time temperature in September in Saint-Nazaire12
    12°C min night temperature
  • 13 hours of daylight per day in September in Saint-Nazaire13
    13 hours of daylight per day
  • No heat & humidity in September in Saint-Nazaire0
    No heat & humidity
  • 66 mm monthly rainfall in September in Saint-Nazaire66
    66 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Saint-Nazaire5
    5 (Moderate) UV index
  • 17°C sea temperature in September in Saint-Nazaire17
    17°C sea temperature

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The September weather guide for France (Saint-Nazaire) 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 Saint-Nazaire in September?

Daytime temperatures usually reach 21°C in Saint-Nazaire in September, falling to 12°C at night.

How sunny is it in Saint-Nazaire in September?

There are normally 6 hours of bright sunshine each day in Saint-Nazaire in September - that's 49% of daylight hours.

How warm is the sea around Saint-Nazaire in September?

The average sea temperature around Saint-Nazaire in September is 17°C.

Does it rain in Saint-Nazaire in September?

There are usually 13 days with some rain in Saint-Nazaire in September and the average monthly rainfall is 66mm.

Saint-Nazaire September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:28 19:49
Monday, 15th September 2025 06:46 19:21
Tuesday, 30th September 2025 07:06 18:50

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