As I recall there’s plans to re-do acid rain, and other cataclysmic weather in connection to a revamped portal/anomaly/biome system.
Still, it was a FANTASTIC source of batteries and acid grenades back in the day and I usually didn’t mind the rain itself so much, crafting raincoats out of plastic bags and keeping in cover (a great time to read or craft while waiting for rain to collect) and munching aspirin when forced to wander around usually kept the pain manageable.
Finding cooking pots though… I remember tearing apart most of a small town looking for a single bloody cooking pot.