Do you think those are rain clouds on the horizon?
The sky was a perfect blue - not a cloud in sight.
Dark clouds massed on the horizon.
Except for the first day, the sun was with us all the time, with absolutely no cloud in the sky. (Preliminary English Test; B1; French)
A huge cloud of smoke from burning oil tanks stretched across the sky.
Some of them leave behind a large cloud of smoke and it damage[s] our health. (First Certificate in English; B2; Spanish)
After I heard I'd got the job, I was on cloud nine!
But now, after the promise in which both said "yes", she was on cloud nine. (Certificate of Proficiency in English; C2; German)
to cloud someone's judgment/vision
Having their judgment somewhat clouded by hormones should not take precedence over all other concerns. (International English Language Testing System; C2; Hebrew)