UV Index
UV Index
Today's UV index in Koper, Slovenia 
will be up to 7.7, indicating a high level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-07-21
With Koper's UV index reaching 7.7, protect your skin from harm by staying in shade, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours, especially between 10 a.m. and 4 p.m. when UV rays are strongest.
The UV index in Koper, Slovenia, generally ranges from low to moderate, peaking during the summer months. This means sunlight intensity varies with the seasons, being strongest around noon in summer.
Koper experiences warm summers and mild winters. Summers are sunny and dry, while winters can be cool and wetter. Spring and autumn bring moderate temperatures with occasional rain, making the weather change smoothly throughout the year.
Compared to the wider region, Koper has a mild coastal climate influenced by the Adriatic Sea. It is warmer and less snowy than inland Slovenia. Neighboring Croatia shares similar coastal weather, while countries farther inland usually have colder winters and more temperature extremes.
See the UV index hour by hour for Koper, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.