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Koper

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Koper Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Koper year round climate

  • Spring (March–May): Average 10.9–19.3°C, mild climate, sunny, moderate rainfall. Suitable for outdoor activities such as hiking and exploring the coastal area. Recommended clothing: light jacket, long-sleeved shirt, and comfortable shoes.
  • Summer (June–August): Average 23.6–26.9°C, hot and dry, occasional showers. Suitable for swimming, sunbathing, and water sports. Recommended clothing: light and breathable clothing, sun hat, and sunscreen.
  • Autumn (September–November): Average 11.9–21.4°C, pleasant climate, but more rainfall, especially in September. Suitable for sightseeing, tasting local food and wine. Recommended clothing: comfortable long-sleeved shirts, jackets, and rain gear.
  • Winter (December–February): Average 7.1–8.7°C, cold and humid climate, occasional rainfall. Suitable for indoor activities such as visiting museums and art galleries. Recommended clothing: warm jacket, scarf, gloves, and hat.

Koper climatological average

Annual average temperature: approx. 16°C / Annual rainfall: approx. 1138 mm / Summer humidity: 65%–75% / Rainiest month: September

Koper monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
7.1°C
62.7
February
8.3°C
30.7
March
10.9°C
60.3
April
13.5°C
50
May
19.3°C
83
June
23.6°C
81
July
26.9°C
68.5
August
25.9°C
152
September
21.4°C
218.5
October
18.2°C
118.5
November
11.9°C
78
December
8.7°C
135.5

Koper weather for the next seven days

7/26
Sunday
Sunny
26.9°C/15.8°C
7/27
Monday
Sunny
28.1°C/16.9°C
7/28
Tuesday
Sunny
31.8°C/18.1°C
7/29
Wednesday
Sunny
34.3°C/19.8°C
7/30
Thursday
Sunny
35.9°C/20.7°C
7/31
Friday
Sunny
38.9°C/22.8°C
8/1
Saturday
Sunny
38.8°C/24.2°C

Koper Frequently Asked Questions and Useful Information for Travel

Is Koper a good holiday destination?

Koper is a captivating holiday destination, often called the city of a thousand suns. It glows with a rich cultural heritage, evident even in its inland areas. Koper's commitment to cultural tourism earned it the prestigious title of European Destination of Excellence (EDEN).

Is Koper, Slovenia walkable from the cruise port?

Yes, Koper is very walkable from the cruise port. Cruise ships typically dock within easy walking distance of the major sights and highlights of Koper, making it convenient to explore the city on foot.

What is the best time to visit Koper?

Autumn is an excellent time to visit Koper. Temperatures are pleasantly comfortable, ranging between 20°C and 25°C, often remaining warm enough for swimming in the sea right through October.

Is Koper safe for solo travelers?

Koper is generally very safe for solo travelers. Slovenia consistently ranks high on global peace indices and has a low crime rate. While exercising caution in crowded areas is always advisable, Koper offers a secure environment for independent travel.

What are some key attractions in Koper?

Koper boasts a wealth of attractions, including the historic Praetorian Palace, the Venetian House, and the beautiful Church of St. Nazarius with its iconic bell tower offering panoramic views. The charming old town itself is a major attraction, perfect for leisurely exploration.