If you planning to travel to Postjona Cave, Postojna, Slovenia, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 6:23 AM. The temperature feels like 39.1 with a humidity level of 71 so dress accordingly. Cloud coverage is 5 percent with visibility at 13.7 percent. Today’s UV index is 2, don’t forget the sunscreen if you need it! Today’s winds are traveling northeast at a speed of 6 MPH. At the end of the day don’t miss the sunset at 3:21 PM.