Luxembourg weather in September
September in Luxembourg: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Luxembourg · #201 of 604 destinations to visit in September · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Luxembourg climate normals — September
| Daytime high | 19°C / 67°F | 😎 nice |
|---|---|---|
| Nighttime low | 10°C / 51°F | |
| Feels like (high) | 18°C / 64°F | |
| Rainfall | 59 mm / 2.3 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 11°C / 51°F | |
| Sunshine | 9 h/day | |
| Daylight | 12.6 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Luxembourg?
Loading map…
Luxembourg in September — FAQ
- Is September a good time to visit Luxembourg?
- September in Luxembourg: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Luxembourg on SeasonMap's comfort score (85/100).
- What is the weather like in Luxembourg in September?
- In September, Luxembourg averages a daily high of 19.4°C and a low of 10.3°C, with about 59.4 mm of rain over roughly 9.2 rainy days.
- What is the air quality in Luxembourg in September?
- Luxembourg has a mean US Air Quality Index of about 42 in September.