I would say yes - hardwood is pretty strong. However, *I* would use
mortise and tenons instead of dowels, unless you're specifically using
oak/maple dowels, because overkill is the best kill, and because I have
the tools to make them already :-)

If you use M&T for the apron to leg joint, and the seat slats, it will
probably be stronger than your floor.

You could also use a half-blind dovetail on the slats (visible from the
top, of course), if you want to try something fancy :-)