Click on a day for an hourly weather forecast
The temperatures in Mostar in September are quite cold with temperatures between 7°C and 25°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Mostar 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 Mostar in September 2025.
If you’re planning to visit Mostar in the near future, we highly recommend that you review the 14 day weather forecast for Mostar before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / -3° | 10 | 18 | 3 | 249 mm | Awful | Mostar in January |
| February | 8° / -2° | 9 | 16 | 3 | 242 mm | Awful | Mostar in February |
| March | 12° / -1° | 9 | 20 | 2 | 198 mm | Awful | Mostar in March |
| April | 17° / 1° | 8 | 22 | 0 | 153 mm | Ok | Mostar in April |
| May | 22° / 4° | 10 | 21 | 0 | 158 mm | Ok | Mostar in May |
| June | 27° / 7° | 9 | 21 | 0 | 136 mm | Good | Mostar in June |
| July | 31° / 9° | 5 | 26 | 0 | 72 mm | Good | Mostar in July |
| August | 31° / 10° | 3 | 28 | 0 | 57 mm | Good | Mostar in August |
| September | 25° / 7° | 6 | 24 | 0 | 139 mm | Perfect | Mostar in September |
| October | 19° / 4° | 6 | 25 | 0 | 189 mm | Good | Mostar in October |
| November | 14° / 4° | 9 | 21 | 0 | 280 mm | Ok | Mostar in November |
| December | 8° / -1° | 10 | 19 | 2 | 234 mm | Awful | Mostar in December |