Boulogne weather in September 2025

Expect daytime maximum temperatures of 18°C in Boulogne in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 14 days with some rainfall and typically 68 mm of rainfall in the month.

  • 18°C maximum daytime temperature in September in Boulogne18
    18°C max day temperature
  • 5 hours of sunshine per day
  • 14 days with some rainfall in September in Boulogne14
    14 days with some rainfall
  • 11°C minimum night-time temperature in September in Boulogne11
    11°C min night temperature
  • 13 hours of daylight per day in September in Boulogne13
    13 hours of daylight per day
  • No heat & humidity in September in Boulogne0
    No heat & humidity
  • 68 mm monthly rainfall in September in Boulogne68
    68 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in September in Boulogne4
    4 (Moderate) UV index
  • 17°C sea temperature in September in Boulogne17
    17°C sea temperature

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The September weather guide for France (Boulogne) 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 Boulogne in September?

Daytime temperatures usually reach 18°C in Boulogne in September, falling to 11°C at night.

How sunny is it in Boulogne in September?

There are normally 5 hours of bright sunshine each day in Boulogne in September - that's 42% of daylight hours.

How warm is the sea around Boulogne in September?

The average sea temperature around Boulogne in September is 17°C.

Does it rain in Boulogne in September?

There are usually 14 days with some rain in Boulogne in September and the average monthly rainfall is 68mm.

Boulogne September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:08 19:38
Monday, 15th September 2025 06:29 19:07
Tuesday, 30th September 2025 06:53 18:33

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