Hey — really nice work on the ARSO integration for Slovenia. 
I was curious whether my Absolute Forecast Card (I built it for SILAM Pollen, but kept it generic) would play nicely with it. Just tried it — looks good.
The card stays close to the stock Weather look when you want it simple; switch to the extended view for temperature + feels-like, precipitation (probability & amount), UV, wind (speed/gust/direction), clouds, humidity, dew point, pressure — with a tiny meteo-risk strip on top. Forecast slots scroll if they don’t fit. It’s a local JS module, so no CDN.
How to give it a spin right now: it ships with SILAM Pollen. Install via HACS, add one location, then add the resource in Settings → Dashboards → Resources → Add —
/local/absolute-forecast-card.js (Resource type: JavaScript Module).
After that, add the card and point it at your ARSO weather.* entity.
More context & discussion:
https://community.home-assistant.io/t/silam-pollen-allergy-proof-your-home-assistant