Remastered Grand Theft Auto: San Andreas fixed the heavy rain issue with a fan fix. In the base build of the game, visibility is almost completely lost in such weather.
The first version of the modification is available to everyone on Patreon for free. Judging by the screenshot, the mod makes the display of the falling drops less bright, while the traces on the ground are still visible. This issue was also fixed in the GTA III remaster.
GTA: The Trilogy – The Definitive Edition, which includes GTA III, Vice City and San Andreas, was released on November 11. Fans called the launch of the kit a massive one and lowered its rating on the Metacritic review aggregator to 0.9 out of 5 points. You can learn more about the problems of the reprint in the material Cybersport.ru.
Watch Visibility in rain in the basic version of the remaster of GTA: San Andreas 
Display of rain before and after installing the modification.
Source: GTATrilogyMods Patreon page