It looks like the 1.21 hotfix for Cyberpunk 2077 not only fixed a few minor issues and police teleportation, but also significantly improved the weather generator. One of the redditors posted a video of heavy rain in Knight City, which he had not seen before during the playthroughs.
He also noted that the rain has started to appear more often in recent hours. With this weather effect, the game looks more like cyberpunk classics than before. Commentators point out that it used to be constantly sunny in the game, but now water has finally poured. Someone played more than 200 hours, but in the open world they saw only the sun. In missions, rain appears due to scripts.
Also, one of the redditors noted that it was acid rain and that this weather should affect the behavior of the NPC, but so far he has not noticed this. Perhaps CDPR will add the feature later.
Cyberpunk 2077 was released on December 10 on PC, PS4, PS5, Xbox One and Xbox Series X.