Weather forecast said it would be around 14C. I thought it over and thought I'd wear a thermal longsleeve under my short sleeved jersey, just to be sure. Just had an errand to run for my wife, and it actually turned out to be 24C. At the end of the one-way I should have taken off the thermal, but I was a bit lazy and thought I'd ride back with it still on. I had the wind in my favor, making it even warmer.

Seriously... The weather is getting awesome