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