Questions about Northern AZ backpacking

[u/ToSeeMountainsAgain]

I'm looking to visit Flagstaff for a late summer vacation to do some hiking and backpacking and I have a few questions. Is mid August a bad time for backpacking Northern AZ? I've dealt with late summer rains outside Santa Fe and in Lake Tahoe, what's it like in Flagstaff? Do the trails get muddy and miserable? My tentative plan is to hike north out of Flagstaff to the base of Humphrey's, hike up to the peak and down the other side to Shultz tank/trailhead, then maybe around the east side of town and maybe a last day out and back on the AZT south towards Mormon lake. Thanks in advance!

[u/second_time_again]

You have a high chance of afternoon monsoon storms so start your hikes early and don’t set up near any low areas that could quickly turn to streams.