Lucerne weather by month
Lucerne runs from about 2°C in December to 22°C in August, with May the wettest month at 227 mm.
warmest month
August
22°C
coolest month
December
2°C
wettest month
May
227 mm
worst air month
December
13 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 3°C | 116 mm | 139 h | 10 |
| February | 7°C | 81 mm | 169 h | 7 |
| March | 8°C | 183 mm | 219 h | 13 |
| April | 10°C | 162 mm | 242 h | 11 |
| May | 14°C | 227 mm | 274 h | 7 |
| June | 18°C | 223 mm | 292 h | 7 |
| July | 21°C | 189 mm | 353 h | 5 |
| August | 22°C | 85 mm | 342 h | 9 |
| September | 15°C | 175 mm | 238 h | 6 |
| October | 12°C | 161 mm | 195 h | 10 |
| November | 6°C | 103 mm | 202 h | 9 |
| December | 2°C | 150 mm | 136 h | 13 |
About 2,801 hours of sun a year. Roughly 186 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 2026-05-27. Full method, licences and the list of sources we rejected are on the methodology page.