The current weather forecast says it's gonna rain on Sunday and Tuesday. On the rest of the days you can expect partly sunny skies.
So if I were you I would hike the Triglav Mount from Krma Valley on Monday.
http://www.hiking-trail.net/hiking_trip/the_krma_valley_triglavski_dom_na_kredarici_mountain_hut_/1/23/201 You can leave your car at the parking lot at 5 AM. At 5 AM it's already bright enough for walking without the need of having a headlamp. And then you're at Kredarica hut at around 8 AM (depending on your shape). After that you can rest there for a while and go to Triglav.
It's a good idea to leave back to the valley before the afternoon because there can be some warm storms later in the day.
If you need a GPX track for this route you can send me a PM.