Temperatures begin to drop, as a new crispness comes to the air, particularly early in the morning and later in the month.
The daily chorus of crickets and katydids will gradually decline.
Apple and crab apple trees hang heavy with fruit. Acorns and hickory nuts begin dropping.
Spots of fall color appear here and there across the landscape. Black gum trees will be among the earliest to "turn" to their fall red.
Squirrels and chipmunks show increased activity throughout the day, gathering nuts to store for the winter.
The fall migration of raptors, shorebirds and songbirds is under way. Waterfowl will be following soon.
Eastern screech owls are reclaiming their feeding territories, pushing their offspring of the year into adjacent territories.
Flocks of blackbirds, including starlings, grackles and red-winged blackbirds, are beginning to gather.
Monarch butterflies - whatever population still exists - have begun migrating to the Sierra Madre Mountains in Mexico.
Wildflowers in September: pink New England aster, purple New England aster, smooth aster, closed gentian, fringed blue gentian, goldenrod, ironweed, Joe-Pye weed, great lobelia, Queen Anne's lace, swamp milkweed, white snakeroot, sneezeweed, tickseed sunflower, teasel, turtlehead and Lyon's turtlehead.