It was a beautiful 14C/57F and sunny this morning. I was tired from yesterday's 66km of riding so during the 20km commute this morning, I took it easy.
The temp was perfectly fine to wear just a jersey but I insist on putting on a light merino long-sleeved shirt underneath. If I look back a couple of months ago, I would have been wearing not much more at much colder temperatures. It might be partly because my body is cool in the morning when I first get up so I need a bit of insulation and then I just continue with it into the ride.
It might rain today, not sure.