Unbelievable that SoCal/northern Mexico is getting rain in September, yet Texas and that whole area is in the midst of one of the worst droughts on record. I haven't seen any satellite imagery, but I'd expect it was beautifully tropical, yes? I can *almost* smell it right now.
Have some H2O2 or OxiDate on hand as a rot preventative, if you see *anything* that looks like it may be going be ready to remove the affected area (treat it like cancer, cut out around the rotted bits or it could spread) and then apply the OxiDate/H2O2. This isn't a guarantee, but it can help prevent a total loss, especially of those top notch top cola buds, which are not only always the prettiest but seem to always be the buds most likely to be lost to crap like this.
This needs to be done carefully, but shaking the buds out after the rain can also prevent moisture from ending up sitting in them. I'm not looking forward to this task later this season. We've got about 6 weeks left, expect harvest mid-October. I ALWAYS get rain before harvest at least once, but it's usually more often.