September is a pleasant shoulder month with milder weather and fewer tourists than midsummer. Early autumn colours begin to appear in the Ardennes and along river valleys. Weather is changeable-warm days can be followed by cooler spells.
SeasonShoulderTemperature 12 to 20°C (54 to 68°F)Crowds ModeratePrices Moderate
High seasonShoulderLow season
Weather by City in September
CityLow / highRain
Luxembourg City
Cool
10°19° 67 mm
Esch-sur-Alzette
Cool
9°19° 69 mm
Dudelange
Cool
9°19° 68 mm
Schifflange
Cool
9°19° 68 mm
Walferdange
Cool
10°19° 63 mm
Bettembourg
Cool
9°19° 66 mm
Pétange
Cool
9°18° 69 mm
Average daily low and high (°C) and monthly rainfall. The badge shows how it feels, allowing for humidity.
Temperature map
-30°-20°-10°0°10°20°30°40°
Average temperature across Luxembourg in September.
Where to Go in Luxembourg in September
Northern Oesling
Ardennes
September often gives the clearest weather of the year: warm days and crisp nights, with chestnut leaves in higher woodlands beginning to colour around Clervaux and Troisvierges. It’s a superb month for long-distance hikes and quiet photography of peat bogs and moorland; river levels drop to comfortable wading levels in some places. Cooler mornings mean you’ll need a light sweater until mid-morning. Harvest fairs and local markets resume, offering a chance to sample regional cheeses and charcuterie.
Central Luxembourg & Gutland
Luxembourg City, Esch area
September offers warm, comfortable days and crisp mornings, ideal for combining city tours with short vineyard trips to nearby Grevenmacher or Remich. Cultural season resumes with theatres and galleries opening new programmes; the city is busy but less crowded than midsummer. Expect occasional autumn rain; an all-purpose jacket and comfortable walking shoes will keep you prepared. Harvest time in surrounding countryside adds food-market events and local wine tastings that make day trips especially rewarding.
Mullerthal / Eastern Sandstone
Little Switzerland, Echternach, Berdorf
September often offers outstanding walking conditions: stable, warm days and crisp nights, plus the first hints of autumn colour in ridge-top woodlands. It’s a superb month for combining rock routes with longer multi-day sections of the Mullerthal Trail before leaves fall, and local food festivals start to spotlight regional produce. Expect fewer crowds than August but still busy weekends. A light fleece for mornings and a durable daypack will keep you comfortable.
Moselle Valley (wine country) and Southern Hills
Remich, Grevenmacher, Schengen
September is harvest season in many years - one of the most atmospheric months as pickers work early on the steep terraces and wine-cellar doors open for new-vintage tastings. Days are often warm and mellow, making vineyard walks and evening tastings especially enjoyable, though occasional rain can interrupt harvest. Festivals and open‑cellar weekends celebrate the grape, so plan ahead for bookings. Bring a light sweater for cooler evenings and comfortable shoes for terraced slopes.
Events & Festivals in September
There are no major festivals or events in Luxembourg during September to be aware of.
Planning a trip to Luxembourg?
See how September compares with the rest of the year, then read the full guide.
