When does autumn start in Denmark, and what is it like?
Mild September, darker and wetter November.
Short answer
In Danish weather statistics autumn covers September, October and November. Autumn tends to be more rainy and overcast than spring and summer, and November is colder with shorter days. Autumn 2025 had a mean temperature of 10,3 °C against a 1991–2020 normal of 9,5 °C, with 241,1 mm of rain. Some years bring an Indian summer: a calm, hazy spell with blue sky, low sun, golden trees and temperatures around 20 °C.
Why
- September often still feels like late summer.
- October brings autumn colours and Halloween in Tivoli.
- From November the Christmas season starts.
Details
Strong autumn colours on the trees usually need widespread night frost first.
Tip
Plan one indoor option per day, such as a museum, because autumn weather in Copenhagen can turn wet and windy quickly.
What may differ
An Indian summer does not happen every year, and its length varies a lot.
Common misconception
Autumn in Denmark is cold from the start of September.
What actually happens
September is often mild: in 2025 the temperature reached 26,0 °C on Lolland on 1 September.
People also ask
- Is October a good time to visit Denmark?
- When are the autumn colours best in Denmark?
- What is Indian summer?
Sources
- DMI: Summary of autumn 2025Checked at:
- DMI: Indian summer and autumn coloursChecked at:
- VisitDenmark: Denmark A-Z, plan your tripChecked at:
- VisitDenmark: Autumn in DenmarkChecked at:
- VisitCopenhagen: The changing seasons of CopenhagenChecked at:
This answer is for reference only. Weather varies a lot from year to year, so check the DMI forecast before you travel.
Weather and seasonsRelated questions
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Is there an official weather app for Denmark?
The official weather app for Denmark is DMI Vejr, made by the Danish Meteorological Institute (DMI).
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What should you do in a thunderstorm in Denmark?
In Denmark 85 % of thunderstorms come in June, July and August, so they matter most for summer trips.
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How do I know if the water is clean enough to swim in Copenhagen?
The City of Copenhagen publishes the daily bathing water quality for its bathing spots on badevand.dk, with the weather and a three day forecast for each place.
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When are there lifeguards at the Copenhagen harbour baths?
Copenhagen has three municipal harbour baths: Islands Brygge, Fisketorvet and Sluseholmen.