I’m currently in the process of leveling up two of my Goomys so
that they’ll both evolve to Sliggoo and one of them can eventually
become Goodra, and I was just wondering if anyone knows when it
will rain. Is the weather on a schedule that someone knows, or is
it totally random? I’m wondering how long I’ll have to wait, and
also how long the rain will last, if there’s a risk I might not
catch it with the level-up.
As far as I'm aware, the weather is random and the only way to
"predict" it is checking the weather
forecast that you can get to by clicking the current weather
castform in the userbar. There you can see the three next weathers
and when they'll change (according to the site time).