I have been worried about going to bed at night and leaving my awning down, it is storm season and you never know when one might blow in. One of MH's here had their awning blown up over the roof earli...
We use and enjoy our manual awning frequently, including sitting under it during moderate rain storms. I try to get a feel for the area we are set up in by observing what the longer term campers are doing. If their awnings appear to have been deployed for quite awhile, I don't get too paranoid about mine. I do keep a careful eye on the weather in any event, and err on the side of caution by retracting it if there's any question in my mind about leaving it out.