I have played through almost a year at this point and except for the rainy day on spring 3rd and a few thunderstorms in summer, there has been absolutely no rain in spring and fall. I don't know if I am extremely lucky or unlucky but there just has been no rain. Apparently it's not just me as I have seen a few comments about it on Twitter. If this doesn't count as a bug I apologize.
Same issue here, also on Switch. Had rain in Spring and Summer year 1, but am now midway through Summer year 2 and haven't had a single day of rain since Summer year 1.
It's mainly frustrating because I couldn't unlock the rain totem recipe in time for Spring year 1, then you can't get truffles you need to make one in winter, so I couldn't catch a walleye for the community bundle.
I finished the mines in fall y1, all the other bundles were done by the start of spring y2, house is fully upgraded, I've just spent the past two in game months screwing around waiting for time to pass