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Mondorf-les-Bains Weather in September
Thinking of visiting Mondorf-les-Bains in September? Expect pleasant temperatures reaching 20°C (68°F) during the day, dropping to 10°C (50°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Mondorf-les-Bains in September
Typically around 12 days of rainfall are expected, averaging 68 mm (2.7 in) for the month. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.
Temperature in Mondorf-les-Bains in September
If you're visiting Mondorf-les-Bains in September, expect excellent temperatures with highs of 20°C (68°F) and overnight lows of 10°C (50°F). 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 Mondorf-les-Bains in September
The month experiences a moderate amount of sunlight, with 172 hours of sunshine. This provides a nice balance between sunshine and clouds.If your ideal day consists of dry skies and pleasant temperatures, June, July, August and September typically offer the best circumstances for Mondorf-les-Bains.
Mondorf-les-Bains Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
20°C (68°F)
Chance of Rain
41%
Precipitation
68 mm (2.7 in)
Rainy days
12 days
Humidity
76% *
Sunshine
172 hours *
Percentage Sunshine
42% *
* Data from: Luxembourg, Luxembourg (12 KM, 8 Miles).
Mondorf-les-Bains Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Mondorf-les-Bains - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Mondorf-les-Bains 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 Mondorf-les-Bains in September
Browse day-by-day weather records for Mondorf-les-Bains spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mondorf-les-Bains historical weather extremes in September
Based on weather observations in Mondorf-les-Bains between 1976 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 15, 2020, with a maximum of 34°C (93°F).
- Mondorf-les-Bains experienced its chilliest September day on September 26, 2010, reaching only 9°C (48°F).
- Nighttime temperatures dropped to 1°C (34°F) on September 26, 2018, marking the coldest September night on record.
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 Mondorf-les-Bains in September
For Mondorf-les-Bains in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Mondorf-les-Bains in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Swimming6/10 -
Cycling10/10 -
Walking10/10 -
Camping8/10 -
Outdoor sports10/10
Mondorf-les-Bains 3-Day Forecast
More climate data for Mondorf-les-Bains
Temperature Rainfall Sunshine Humidity
See the full Mondorf-les-Bains 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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