Koper in December
5.4out of 10
Not the best time
Cool: highs only around 8°C. Frequent rain: about 10 rainy days.
8°CAvg high
3°CAvg low
10Rainy days (112 mm)
8:31 hDaylight
07:46Sunrise · 16:17 Sunset
Why this score
- Cool: highs only around 8°C
- Frequent rain: about 10 rainy days
- Rain varies a lot between years (±4.6 days)
What to wear and pack
- A warm jacket
- Rain jacket or compact umbrella
How reliable is the forecast?
Rain in December varies a lot between years (±4.6 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 7°C | 3°C | 77 mm | 9 | – | – | 5.5 |
| February | 8°C | 3°C | 85 mm | 9 | – | – | 5.7 |
| March | 12°C | 6°C | 86 mm | 9 | – | – | 6.2 |
| April | 16°C | 9°C | 95 mm | 11 | – | – | 6.5 |
| May | 20°C | 14°C | 103 mm | 12 | – | – | 7.1 |
| June | 24°C | 18°C | 84 mm | 10 | – | – | 7.7 |
| July | 27°C | 20°C | 62 mm | 8 | – | – | 8.0 |
| August | 27°C | 20°C | 90 mm | 9 | – | – | 7.9 |
| September | 22°C | 16°C | 146 mm | 10 | – | – | 7.4 |
| October | 17°C | 12°C | 157 mm | 13 | – | – | 6.3 |
| November | 12°C | 8°C | 167 mm | 13 | – | – | 5.4 |
| December | 8°C | 3°C | 112 mm | 10 | – | – | 5.4 |
Frequently asked questions
How hot is Koper in December?
Daytime highs average 8°C and nights about 3°C.
When is the best time to visit Koper?
The best months are July, August, June, September.