Those are good spiders. We call them garden spiders here. Is that what you call them? I haven't seen as many this year as in the past - I miss them! Last year I had one build a web across an arbor - I had to duck down to walk past.
I read that they are harmless and are called Black and Yellow Argiope (Argiope Aurantia). This one is really large and even though I knew it was harmless to me, I just couldn't get too close to it, too scary. It built that large web in one night - amazing.