Spider webs on the porch are a sure sign of autumn. I have those yellow banana spiders on my front porch...do you have any ? I try to leave them because they eat the bad insects. In the evenings you can see the spiders come down out of the trees for the nights catch....they usually catch me when I'm out hunting armadillos in the middle of the night......oooouuuuu gross, I hate that. I try to remember to walk around like I'm swimming so the webs won't get in my hair !