It’s pronounced your-uh-ness by pretty much everyone (or your-ah-noose if your going by the greek god and not the Latin copy/paste.)
Growing up in Australia, the British 'you-ray-nəs' (i.e. not quite 'your anus', but only because of the first vowel sound) is the pronunciation I was familiar with. Lately I've heard 'you-rə-nəs' fairly often, but not exclusively.
Good to know, I guess...
Uranium and Urine
I doubt that Οὐρανός is pronounced anywhere close to "your-ah-noose", unless you're pronouncing "your-ah-noose" in a very strange way.
This just sounds like "urine us". Potato, potato?
And, that's why this place is great.
[1] https://www.dollarshaveclub.com/content/story/anus-urine-us-...
edit: sorry, just realised I probably misread you (as saying we should say where we're from and use IPA), in which case this comment is redundant.