Climate averages 1991–2020
Lausanne weather
in September.
A mild, wet month: the 4th warmest and the joint 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Lausanne: daytime highs average 18.8°C and nights cool to about 13.2°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 108 mm of rain on roughly 12 days, which makes September a wet month (the joint 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 36 min on an average September day.
The nearest other city in this atlas is Geneva (51 km away). In September its highs average 19.8°C, 1.0°C warmer than Lausanne, with 109 mm of rain.
Among the 8 cities listed in Switzerland, Lausanne ranks 5th of 8 for the warmest September highs and 4th of 8 for the driest September (rainfall, lowest first). The mean September high of those 8 cities is 18.8°C; Lausanne is level with that mean.
From September to October, average highs fall by 3.9°C to 14.9°C, and monthly rainfall falls from 108 mm to 101 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Lausanne climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.1°C0.5°C | 0.5°C | 108 | 12.7 | 9.09 h |
| February | 6.1°C0.5°C | 0.5°C | 97 | 11.5 | 10.310 h |
| March | 9.5°C2.8°C | 2.8°C | 94 | 12.3 | 11.912 h |
| April | 13.1°C5.5°C | 5.5°C | 90 | 12.3 | 13.514 h |
| May | 16.8°C9.6°C | 9.6°C | 120 | 13.9 | 15.015 h |
| June | 20.5°C13.7°C | 13.7°C | 106 | 12.8 | 15.816 h |
| July | 22.7°C16.4°C | 16.4°C | 117 | 12.2 | 15.415 h |
| August | 22.8°C16.8°C | 16.8°C | 116 | 12.4 | 14.214 h |
| September, selected | 18.8°C13.2°C | 13.2°C | 108 | 11.7 | 12.613 h |
| October | 14.9°C9.5°C | 9.5°C | 101 | 12.4 | 10.911 h |
| November | 9.3°C4.7°C | 4.7°C | 116 | 13.1 | 9.59 h |
| December | 5.8°C1.6°C | 1.6°C | 125 | 13.5 | 8.79 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Geneva in SeptemberSwitzerland · 51 kmHigh 19.8°C · Low 11.6°C · 109 mm rain
- Bern in SeptemberSwitzerland · 79 kmHigh 17.7°C · Low 9.6°C · 88 mm rain
- Besançon in SeptemberFrance · 94 kmHigh 20.2°C · Low 12.0°C · 93 mm rain
- Basel in SeptemberSwitzerland · 136 kmHigh 20.1°C · Low 10.8°C · 95 mm rain
- Luzern in SeptemberSwitzerland · 141 kmHigh 18.9°C · Low 11.6°C · 166 mm rain
- Mulhouse in SeptemberFrance · 147 kmHigh 19.7°C · Low 11.2°C · 74 mm rain
- Dijon in SeptemberFrance · 152 kmHigh 20.8°C · Low 12.0°C · 75 mm rain
- Villeurbanne in SeptemberFrance · 159 kmHigh 21.8°C · Low 12.9°C · 93 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Lausanne) is explained once on the Lausanne year overview and on the Sources, method and limits page.