Actually this monsoon season has largely been a bust - discounting a recent uptick in moisture due to Hurricane Jimena remnants - overall, it’s quite dry out there compared to normal at this time of year. This includes Tucson.
Were it a strong monsoon season, this can sometimes yield autumn water conditions on par with an average spring along the trail, though it does tend to be more spotty due to the capricious nature of summer storms, and is more likely to deteriorate the farther into autumn the hike progresses.
I would be cautious about hiking the AZT this fall unless you were really feeling your oats while heading across the Mojave this spring on the PCT. But stay tuned, because the meteorological word is that a strong El Nino pattern is starting to set up, which may or may not have any short-term positive effect on the current drought across AZ.
http://drought.unl.edu/DM/MONITOR.html
blisterfree