first off - pla works best with a heated printbed, anyone who tells you otherwise is an idiot :-)
65c work best.

Second: what slicer are you using ?

And how do you calibrate the printbed ?
Ie: properly by hand or with a topographical sensor ?

And, no you shouldn't need supports on that bowl.

Your extrusion temp is fine, just looks like you're printing the first layer too far away from the bed.