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
  17°C max day temperature
• 5
  5 hours of sunshine per day
• 15
  15 days with some rainfall
• 10
  10°C min night temperature
• 13
  13 hours of daylight per day
• 0
  No heat & humidity
• 70
  70 mm of monthly rainfall
• 3
  3 (Moderate) UV index
• 16
  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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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.

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