I've grown to enjoy riding in the rain. At least when it isn't cold and the rain feels like sharp ice needles. I rode in the rain twice so far this week but it's so warm outside the only discomfort I had was having to ride without my sunglasses on (and that's no big deal).
If it was a bit chillier I would've craved my merino wool tshirt beneath my jersey. But dressed in space age, quick drying fabrics I find that my riding clothes don't feel heavy or clinging or dragging as if I was wearing jeans and a cotton tshirt.
In the summer I don't bother with a rain jacket or rain pants. Only when it's cold out. I'd rather bring a dry tshirt and a camp towel in my bag so I don't look like I drowned part way to my destination.
Sandals! I'm now only wearing sandals on all my rides and that helps on a rainy ride since my feet dry very fast.