I know they will probably add it eventually but a weather system would be great and with it when it rain water container can fill up but to not make it to easy for infinite water when it is sunny water can evaporate.

But would falling rain drops hurt? Would we need umbrellas or leaf boats? A storm could be hard! It could damage your base made out of grass and toothpicks!

Boat could be nice to ! I dont know how you say it in english but like the trench coud fill up to it can make little river.. and for the damage on your base they can add some kind of structure to reinforce the wall and roof ?

That is fair.  I like the idea of weather but it would have up sides and down sides. Oh gosh I hope no snow! Most insect creatures can't survive the harsh temperatures like winter!