Click on a day for an hourly weather forecast
The temperatures in Koper in September are comfortable with low of 15°C and and high up to 24°C.
You can expect rain for roughly half of the month of September in Koper. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Koper in September 2024.
If you’re planning to visit Koper in the near future, we highly recommend that you review the 14 day weather forecast for Koper before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 0° | 8 | 22 | 2 | 154 mm | Awful | Koper in January |
| February | 9° / 1° | 8 | 18 | 2 | 204 mm | Awful | Koper in February |
| March | 12° / 3° | 8 | 22 | 1 | 161 mm | Bad | Koper in March |
| April | 17° / 8° | 7 | 23 | 0 | 143 mm | Ok | Koper in April |
| May | 21° / 11° | 11 | 20 | 0 | 219 mm | Ok | Koper in May |
| June | 25° / 16° | 10 | 20 | 0 | 206 mm | Good | Koper in June |
| July | 28° / 19° | 8 | 23 | 0 | 166 mm | Good | Koper in July |
| August | 28° / 20° | 7 | 24 | 0 | 148 mm | Good | Koper in August |
| September | 24° / 15° | 9 | 21 | 0 | 240 mm | Good | Koper in September |
| October | 18° / 10° | 7 | 24 | 0 | 198 mm | Ok | Koper in October |
| November | 13° / 6° | 10 | 20 | 0 | 272 mm | Bad | Koper in November |
| December | 9° / 2° | 8 | 22 | 1 | 224 mm | Bad | Koper in December |