Welcome. I also just recently picked up my first bike, and I have NOT been riding for 20 years.
It rained here (Middle Tennessee) yesterday, and last night the roads were still just a little wet, and the temperature was awesome (71). I had assumed I wasn't going to ride yesterday at all, but I decided to go out and see how I felt. Good ride. Glad I went. I just did 11 miles, but I need all the practice I can get, as a new rider. And it was good for the confidence to be out there under less than totally dry conditions. It was a nice change to not have to wring out my clothes when I got back.