It was dry at my house and the radar looked clear until after 8am, so I went for it. At about 45F it wasn't cold really, but not a great temp for riding in the rain. It was just a light rain for the last four miles of my commute. Nothing horrible. I was wearing shorts so my knees got a little cold. I didn't take any of my extra mileage routes and got to the office about 15 minutes early. That allowed a little extra time to dry off, make a hot chocolate and warm up a bit.
It could be rainy all day too.