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Luxembourg Weather in September
In Luxembourg, September brings pleasant daytime temperatures around 20°C (68°F), with nights cooling to 10°C (50°F). Expect quite a bit of rainfall this month.
Rainfall in Luxembourg in September
The climate data from previous years indicates about 13 days of rain, averaging 67 mm (2.6 in) for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.
Temperature in Luxembourg in September
The excellent temperature in Luxembourg in September makes it a solid month to visit, with 20°C (68°F) during the day and 10°C (50°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows of 10°C (50°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Luxembourg in September
The city usually sees around 172 hours of sunlight, indicating a moderately sunny period.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Luxembourg.
Luxembourg Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
20°C (68°F)
Chance of Rain
43%
Precipitation
67 mm (2.6 in)
Rainy days
13 days
Humidity
76%
Sunshine
172 hours
Percentage Sunshine
42%
Luxembourg Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Luxembourg - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Luxembourg typically drop from around 20°C (68°F) at the start of September to approximately 17°C (63°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 12°C (54°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Luxembourg in September
Browse day-by-day weather records for Luxembourg spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Luxembourg historical weather extremes in September
According to our 50 years of weather records for Luxembourg, the following extremes were recorded between 1976 and 2026.
- On September 15, 2020, temperatures climbed to 32°C (90°F), marking the warmest September day on record.
- On September 26, 2010, Luxembourg saw its coldest September day with temperatures maxing out at 9°C (48°F).
- The coldest night in September in Luxembourg was on September 20, 1978, with a minimum of 2°C (36°F).
Best Places in Luxembourg in September
Find out more about the weather in Luxembourg and which places have the best travel conditions in this month. See all of Luxembourg in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Luxembourg in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Luxembourg in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling10/10 -
Walking10/10 -
Camping8/10 -
Outdoor sports10/10
Luxembourg 3-Day Forecast
More climate data for Luxembourg
Temperature Rainfall Sunshine Humidity
See the full Luxembourg climate overview or explore weather in Luxembourg.
Popular in September
Where to go in September - average daytime high across popular destinations.
Mondorf-les-Bains
20°C (68°F) Remich20°C (68°F) Luxembourg20°C (68°F) Berdorf20°C (68°F) Vianden19°C (66°F) Echternach20°C (68°F) Clervaux19°C (66°F) Enscherange19°C (66°F) Bucket list
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