St Malo weather in September 2025

Expect 20°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in St Malo in September. Check more long-term weather averages for St Malo in September before you book your next holiday to France in 2025/2026.

  • 20°C maximum daytime temperature in September in St Malo20
    20°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in St Malo13
    13 days with some rainfall
  • 12°C minimum night-time temperature in September in St Malo12
    12°C min night temperature
  • 13 hours of daylight per day in September in St Malo13
    13 hours of daylight per day
  • No heat & humidity in September in St Malo0
    No heat & humidity
  • 62 mm monthly rainfall in September in St Malo62
    62 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in St Malo4
    4 (Moderate) UV index
  • 18°C sea temperature in September in St Malo18
    18°C sea temperature

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The September weather guide for France (St Malo) 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 St Malo in September?

Daytime temperatures usually reach 20°C in St Malo in September, falling to 12°C at night.

How sunny is it in St Malo in September?

There are normally 6 hours of bright sunshine each day in St Malo in September - that's 46% of daylight hours.

How warm is the sea around St Malo in September?

The average sea temperature around St Malo in September is 18°C.

Does it rain in St Malo in September?

There are usually 13 days with some rain in St Malo in September and the average monthly rainfall is 62mm.

St Malo September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:25 19:50
Monday, 15th September 2025 06:45 19:20
Tuesday, 30th September 2025 07:06 18:49

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