I've ridden many miles both ways, and for me anything above 60F I don't wear a base. Just a freakin' regular short sleeve cycling jersey - 3 back pockets & a zipper! It ain't rocket science.

Below about 60F I wear New Balance "Lightning Dry Extreme" or Adidas "Clima-Cool" base shirts - whichever's on sale. Those are the best I've found. Nike "Dri-Fit" sucks, and I'm not paying the premium prices for Under Armor because it's the new trendy brand right now.