Reported numerously in several topics… visibility (not due clouds) is not implemented nor adjustable.
Please implement this critical weather behavior.
An example when looking up bad weather airports.
VOCI 221430Z 28003KT 4500 HZ FEW080 29/22 Q1011 NOSIG
SIM reported weather is not too off, 3KM visibility - see ATIS captured in the screenshot.
However, horizontal visibility is unaffected.
Please also vote for this very relevant wishlist topic, as it getting significant number of votes already: Ability to change Meteorological Visibility / RVR