Sonderborg weather in September 2025

Expect 17°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Sonderborg in September. Check more long-term weather averages for Sonderborg in September before you book your next holiday to Denmark in 2025/2026.

  • 17°C maximum daytime temperature in September in Sonderborg17
    17°C max day temperature
  • 5 hours of sunshine per day
  • 15 days with some rainfall in September in Sonderborg15
    15 days with some rainfall
  • 10°C minimum night-time temperature in September in Sonderborg10
    10°C min night temperature
  • 13 hours of daylight per day in September in Sonderborg13
    13 hours of daylight per day
  • No heat & humidity in September in Sonderborg0
    No heat & humidity
  • 70 mm monthly rainfall in September in Sonderborg70
    70 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Sonderborg3
    3 (Moderate) UV index
  • 16°C sea temperature in September in Sonderborg16
    16°C sea temperature

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The September weather guide for Denmark (Sonderborg) 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 Denmark

How warm is it in Sonderborg in September?

Daytime temperatures usually reach 17°C in Sonderborg in September, falling to 10°C at night.

How sunny is it in Sonderborg in September?

There are normally 5 hours of bright sunshine each day in Sonderborg in September - that's 38% of daylight hours.

How warm is the sea around Sonderborg in September?

The average sea temperature around Sonderborg in September is 16°C.

Does it rain in Sonderborg in September?

There are usually 15 days with some rain in Sonderborg in September and the average monthly rainfall is 70mm.

Sonderborg September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:28 19:13
Monday, 15th September 2025 05:54 18:37
Tuesday, 30th September 2025 06:22 17:59

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