Re: Late August swarm cells?
Pull the queen and make the split. If the new queen doesn't get mated, recombine in a month. If you let them swarm, you lose the queen, a bunch of bees, and run the risk of the new queen not getting mated with no recourse. Note which hives these are and be prepared for the same thing to happen next year. I have a hive that likes to swarm in September. Two years in a row, same hive. Ready for them this year.
Thankfully, the bees are smarter than I am. They are doing well, in spite of my efforts to help them.