Saint-Nazaire weather in September 2025

Expect 70°F daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Saint-Nazaire in September. Check more long-term weather averages for Saint-Nazaire in September before you book your next holiday to France in 2025/2026.

  • 70°F maximum daytime temperature in September in Saint-Nazaire70
    70°F max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in Saint-Nazaire13
    13 days with some rainfall
  • 54°F minimum night-time temperature in September in Saint-Nazaire54
    54°F 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
  • 2.6 inches monthly rainfall in September in Saint-Nazaire2.6
    2.6 inches of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Saint-Nazaire5
    5 (Moderate) UV index
  • 63°F sea temperature in September in Saint-Nazaire63
    63°F sea temperature

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Saint-Nazaire by month

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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)  |  Imperial (°F)

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More about France

How hot is it in Saint-Nazaire in September?

Daytime temperatures usually reach 70°F in Saint-Nazaire in September, falling to 54°F 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 63°F.

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 2.6 inches.

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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