We are all used to the Minecraft Bedrock Edition that rainfall does no harm. However, now everything will be different in Minecraft on Android, because there is the Apocalyptic Rain mod. Remember the fire and brimstone from heaven? So, now in Minecraft BE everything will be just that.
From such a rain in the MCBE, you can hide only inside some stone buildings. And after with “nuclear” rainfall, in MCPE the biome will turn into a real scorched wasteland. Have a nice survival with this mod!