Once you accept that you'll be wet, riding in the rain is relaxing. One day I had to drive an office car for 2-3 hours in the pouring rain. It was hell.
I got to the office, changed to my cycling clothes, and rode home. That was one of my most relaxing rides home ever.
Of course, too much rain can be a problem, as I explained in
this thread . But hey, that was fun too, once I got through it.