Click on a day for an hourly weather forecast
The temperatures in Lucerne in September are quite cold with temperatures between 9°C and 20°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Lucerne 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 Lucerne in September 2025.
If you’re planning to visit Lucerne in the near future, we highly recommend that you review the 14 day weather forecast for Lucerne before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / -4° | 9 | 11 | 11 | 157 mm | Awful | Lucerne in January |
| February | 5° / -4° | 8 | 9 | 11 | 112 mm | Awful | Lucerne in February |
| March | 9° / -1° | 8 | 16 | 7 | 127 mm | Awful | Lucerne in March |
| April | 14° / 2° | 8 | 20 | 2 | 130 mm | Bad | Lucerne in April |
| May | 18° / 5° | 13 | 17 | 0 | 253 mm | Ok | Lucerne in May |
| June | 22° / 9° | 12 | 18 | 0 | 259 mm | Ok | Lucerne in June |
| July | 24° / 11° | 13 | 18 | 0 | 271 mm | Good | Lucerne in July |
| August | 24° / 12° | 10 | 21 | 0 | 222 mm | Good | Lucerne in August |
| September | 20° / 9° | 7 | 23 | 0 | 127 mm | Ok | Lucerne in September |
| October | 16° / 6° | 6 | 25 | 0 | 136 mm | Good | Lucerne in October |
| November | 10° / 2° | 7 | 19 | 4 | 135 mm | Awful | Lucerne in November |
| December | 6° / -2° | 9 | 14 | 9 | 161 mm | Awful | Lucerne in December |