Click on a day for an hourly weather forecast
The temperatures in Lausanne in September are usually low and can range between 10°C and 19°C.
You can expect about 3 to 8 days of rain in Lausanne during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Lausanne in September 2025.
If you’re planning to visit Lausanne in the near future, we highly recommend that you review the 14 day weather forecast for Lausanne before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / -2° | 10 | 10 | 12 | 156 mm | Awful | Lausanne in January |
| February | 5° / -2° | 9 | 10 | 11 | 128 mm | Awful | Lausanne in February |
| March | 9° / 1° | 7 | 17 | 7 | 122 mm | Awful | Lausanne in March |
| April | 13° / 5° | 7 | 21 | 2 | 108 mm | Awful | Lausanne in April |
| May | 16° / 7° | 10 | 21 | 0 | 174 mm | Ok | Lausanne in May |
| June | 21° / 11° | 10 | 20 | 0 | 182 mm | Ok | Lausanne in June |
| July | 23° / 13° | 9 | 22 | 0 | 164 mm | Good | Lausanne in July |
| August | 23° / 13° | 8 | 23 | 0 | 149 mm | Good | Lausanne in August |
| September | 19° / 10° | 5 | 25 | 0 | 99 mm | Good | Lausanne in September |
| October | 15° / 6° | 5 | 25 | 1 | 118 mm | Good | Lausanne in October |
| November | 9° / 3° | 8 | 18 | 5 | 146 mm | Awful | Lausanne in November |
| December | 5° / 0° | 10 | 11 | 10 | 203 mm | Awful | Lausanne in December |