We have a few of these in our front yard in North Carolina only at night only in the Fall. They spin gigantic webs (roughly 2×2 feet )–but with a very strong anchor webbing that often goes 10-15 feet to the web itself. The spiders are large with a big abdomen,and they have hairs on their legs (as can be seen in the picture). By morning, the webs are gone completely and the spiders can’t be found. They seem somewhat like barn spiders, but the fine-scale concentric web weaving seems different. Let us know what you think they are.
Tha Barn Spider, Araneas cavaticus, is just one of a large genus known collectively as Orb Weavers. Most have the behavior you describe, including building a large web nightly, and hiding by day. I can’t commit to an exact species in your case.