Looks like some of the photos submitted of a brown widow, but honestly, I have no idea
This spider had a irregular shaped web about 6” x 4” on the patio of our home.
Looks to be a Venusta orchard spider, Leucauge venusta.
That’s a very good possibility. However, most of the photos I saw of those make the legs look green. This one appears more brown. Is that just a common difference?
Yes, the legs can range from very dark brown to green (depending on maturity and lighting). They’re recognizable by the metallic orange ‘smiley face’ on the underside of the abdomen.