Luxembourg City weather by month
Luxembourg City runs from about 2°C in January to 19°C in August, with May the wettest month at 151 mm.
warmest month
August
19°C
coolest month
January
2°C
wettest month
May
151 mm
worst air month
January
13 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 2°C | 99 mm | 97 h | 13 |
| February | 7°C | 131 mm | 94 h | 9 |
| March | 8°C | 100 mm | 209 h | 13 |
| April | 9°C | 75 mm | 257 h | 8 |
| May | 14°C | 151 mm | 293 h | 7 |
| June | 16°C | 60 mm | 328 h | 6 |
| July | 18°C | 80 mm | 353 h | 5 |
| August | 19°C | 61 mm | 351 h | 7 |
| September | 15°C | 105 mm | 260 h | 6 |
| October | 12°C | 99 mm | 182 h | 8 |
| November | 6°C | 64 mm | 94 h | 9 |
| December | 3°C | 72 mm | 58 h | 12 |
About 2,576 hours of sun a year. Roughly 110 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.