Click on a day for an hourly weather forecast
The weather in Koper in August is hot. The average temperatures are between 20°C and 28°C.
You can expect about 3 to 8 days of rain in Koper during the month of August. 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 Koper in August 2025.
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 |