[MarkoN]

There is a function to check if a player is in interior IsPlayerInAnyInterior
https://sampwiki.blast.hk/wiki/Useful_Fu...rInAnyInterior
ex.

pawn Код:

if(IsPlayerInAnyInterior(playerid))
{
SetPlayerWeather(playerid, 1);
}

EDIT:
ups . didn't see that its a custom made map.
just use https://sampwiki.blast.hk/wiki/IsPlayerInRangeOfPoint and change the weather