Lucerne weather in September
September in Lucerne: nice, rainy, with clean air — an excellent time to visit.
#3 of 12 months in Lucerne · #245 of 604 destinations to visit in September · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Lucerne climate normals — September
| Daytime high | 21°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 13°C / 55°F | |
| Feels like (high) | 21°C / 70°F | |
| Rainfall | 138 mm / 5.4 in | 🌧 rainy |
| Rainy days | 15 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 13°C / 56°F | |
| Sunshine | 9.3 h/day | |
| Daylight | 12.6 h | |
| Wind | 8 km/h / 5 mph | |
| Snowfall | 0.7 cm / 0.3 in | |
| Air quality (US AQI) | 50 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Lucerne in September — FAQ
- Is September a good time to visit Lucerne?
- September in Lucerne: nice, rainy, with clean air — an excellent time to visit. It ranks #3 of 12 months for Lucerne on SeasonMap's comfort score (83/100).
- What is the weather like in Lucerne in September?
- In September, Lucerne averages a daily high of 20.5°C and a low of 13°C, with about 138.1 mm of rain over roughly 14.6 rainy days.
- What is the air quality in Lucerne in September?
- Lucerne has a mean US Air Quality Index of about 50 in September.