Koper is the biggest town on the Slovenian coast and the climate here is more Mediterranean from other parts of Slovenia. Summer temperatures rarely exceed 30°C and winter temperatures seldom drop below freezing. The cold Bora winds blow during the winter months and the south wind called Jugo brings clouds and rain, but there is plenty of sunshine at this time.
When to go – the best time to visit Koper
As with all Adriatic Sea destinations, the high season for visitors to Koper and its surroundings is the summer, from June to early September.
Summers in Koper are fairly hot and sunny, with average daytime temperatures between 23°C and 30°C, but sometimes quite higher, 35°C or more. There are usually around 10 hours of sunshine a day in July and August, so it’s worth packing some sunscreen in anticipation of the fine weather and clear skies. Hot temperatures are usually tempered by a cooling summer breeze, making the climate feel quite comfortable. Evening summer temperatures in Koper are pleasant enough to be able to sit on the terraces and eat outside. However, the odd summer thunderstorm can sometimes break up the sunshine during the summer.
Autumn is a great time to visit Koper, with temperatures at a nice comfortable level between 20°C and 25°C. This means that it’s often warm enough to continue swimming in the sea right through until October.
The winter weather and climate in Koper is quite mild compared to other parts of Slovenia and frost and snow are experienced very infrequently. Look out for the bora wind, which is a strong wind that brings blustery and rather cold weather to the town. Temperatures in Koper tend to stay between 4°C and 8°C during the winter months.
Springtime in Koper brings with it a relatively mild climate. From May onwards, temperatures can reach around 20°C, which means that it is sometimes mild enough for visitors to be able to comfortably swim in the sea.
KOPER YEARLY WEATHER SUMMARY
What’s the best time to travel to Koper in Slovenia? Here are some facts:
– The months May, June, July, August, September and October have a nice average temperature.
– July is the warmest month with an average high of 28,8 °C and an average low of 16,9 °C.
– July is also the month with the most sunshine, with 11 hours per day.
– January is the coolest month with an average high of 8,9 °C and an average low of 0,7 °C.
– September is the wettest month with an average of 118 millimeters of precipitation.
– December and January are the most cloudy months with an average of 12 mostly cloudy days.
– July is the driest month with an average of 56 millimeters of rainfall.
– January is the month with the most snowfall, with a little over 3 centimetres on average.
For more specific information about the climate of Koper, Slovenia, please take a look at the graphs shown below.
A climate graph for Koper, Slovenia showing mean daily maximum and minimum temperature for a month and average monthly precipitation (rain/snow).
Graph showing average monthly hours of sunshine and average monthly number of cloudy days for Koper, Slovenia.
Graph showing average monthly number of days with precipitation, average monthly number of days with snow cover and average monthly snowfall (in cm) for Koper, Slovenia.
Graph showing average monthly number of hot and cold days for Koper, Slovenia.
 Koper or Capodistria as it is called in Italian shows two faces to the world: one is a modern, loud and busy industrial part of the city with the only commercial port in Slovenia. The other is the charming small Old Town with the lovely square of Titov Trg and late medieval and early Renaissance buildings, such as the Praetorian Palace, the Loggia Palace and the Cathedral of the Assumption built in Venetian styles. |