@Idmarko Unfortunately, even if you have any of the weather options turned off, on days with a yellow question mark, you can still get any kind of weather. You might want to search on EA Answers for a link to a bug report about it and click 'me too' if you find one. That's probably the best way to get the Devs attention that this is a big problem for many Simmers. Especially since some are extremely afraid of thunderstorms or are triggered by loud noises. I hope they fix it because, in my opinion, if your game is set for no thunderstorms, you should've get any at all, period!
As for the umbrella situation, I've never had any of my Sims get a black umbrella if they haven't previously chosen any, they just get soaked. However, I have taken away black umbrellas from vampires that have sun immunity, like Caleb, and the next time I see them, they STILL have one. *sigh* I'm sure it's just because vampires are coded to have umbrellas in the Sun no matter what since it was a request from Simmers. But, again, in my opinion, if a vampire has sun immunity, the game should recognize that and not automatically give them one. *shrugs*
Happy Simming anyway! <3