Click on a day for an hourly weather forecast
The temperatures in Ljubljana 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 Ljubljana 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 Ljubljana in September 2025.
If you’re planning to visit Ljubljana in the near future, we highly recommend that you review the 14 day weather forecast for Ljubljana before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -4° | 6 | 15 | 10 | 102 mm | Awful | Ljubljana in January |
| February | 4° / -3° | 6 | 13 | 9 | 141 mm | Awful | Ljubljana in February |
| March | 9° / 1° | 6 | 22 | 4 | 112 mm | Bad | Ljubljana in March |
| April | 15° / 4° | 6 | 23 | 1 | 106 mm | Good | Ljubljana in April |
| May | 20° / 8° | 9 | 22 | 0 | 174 mm | Ok | Ljubljana in May |
| June | 25° / 11° | 8 | 22 | 0 | 148 mm | Good | Ljubljana in June |
| July | 27° / 13° | 7 | 24 | 0 | 156 mm | Good | Ljubljana in July |
| August | 26° / 13° | 6 | 25 | 0 | 127 mm | Perfect | Ljubljana in August |
| September | 20° / 9° | 6 | 24 | 0 | 158 mm | Good | Ljubljana in September |
| October | 14° / 6° | 5 | 26 | 0 | 118 mm | Good | Ljubljana in October |
| November | 9° / 3° | 7 | 21 | 1 | 153 mm | Bad | Ljubljana in November |
| December | 4° / -2° | 6 | 19 | 6 | 125 mm | Awful | Ljubljana in December |