I guess you mean real world weather? If so, yes I would love that too. Maybe even an historical weather database. So a server could type in a date of a past race weekend and the game will replicate the correct weather based off of records via a weather website. Might be asking too much there though. But would be a nice feature, imo.
Omg! Just think of a 24/7 open Nordschleife only server always with the real weather and day and night times! Thats amazing!