The honey flow for the year is essentially complete. The prime nectar sources have now completed their bloom. In our area these were yellow sweet, white sweet, ladino and Dutch clovers. Trees that contribute to the honey flow are basswood, linden and black locust. These trees completed their contribution in June.
There are a few plants still in flower, but they are not large nectar sources. At best the bees are just able to break even. A walk through the fields shows alfalfa, trefoil, goldenrod/ragweed, Joe Pye weed and thistles doing their part to feed the bees. Goldenrod occasionally gives a good honey flow. Soybeans are also still in bloom.
Asters, a fall blooming flower, will begin flowering soon. However, in rural areas asters are usually not very abundant unless artificially planted. Bees in urban areas will work this flower family in earnest. As a side note: Goldenrod is classified as part of the aster family.
With the late summer nectar dearth under way you should be on the lookout for robbing. For weaker hives a good preventative measure is to install the entrance reducer with the 5 inch opening in position.