60 birds were recorded seen in Michigan in September in our iNaturalist sample; 6 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in September

Mallard

Great Blue Heron
Canada Goose

Wild Turkey
Sandhill Crane

Ring-billed Gull

Great Egret

Ruby-throated Hummingbird

Red-tailed Hawk

Double-crested Cormorant

Blue Jay

Tennessee Warbler
All birds seen in Michigan in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 677 | Apr (past peak) |
| 2 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 670 | Aug (past peak) |
| 3 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 598 | Apr (past peak) |
| 4 | Wild Turkey | Meleagris gallopavo | Pheasants, Grouse, and Allies | 571 | Apr (past peak) |
| 5 | Sandhill Crane | Antigone canadensis | Cranes | 478 | May (past peak) |
| 6 | Ring-billed Gull | Larus delawarensis | Gulls, Terns, and Skimmers | 463 | Jul (past peak) |
| 7 | Great Egret | Ardea alba | Herons, Egrets, and Bitterns | 389 | Aug (past peak) |
| 8 | Ruby-throated Hummingbird | Archilochus colubris | Hummingbirds | 368 | Aug (past peak) |
| 9 | Red-tailed Hawk | Buteo jamaicensis | Hawks, Eagles, and Kites | 336 | Apr (past peak) |
| 10 | Double-crested Cormorant | Nannopterum auritum | Cormorants and Shags | 325 | Aug (past peak) |
| 11 | Blue Jay | Cyanocitta cristata | Crows, Jays, and Magpies | 318 | May (past peak) |
| 12 | Tennessee Warbler | Leiothlypis peregrina | New World Warblers | 318 | Sep (peak) |
| 13 | American Goldfinch | Spinus tristis | Finches, Euphonias, and Allies | 313 | Aug (past peak) |
| 14 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 304 | May (past peak) |
| 15 | Black-capped Chickadee | Poecile atricapillus | Tits, Chickadees, and Titmice | 303 | Apr (past peak) |
| 16 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 301 | Apr (past peak) |
| 17 | Wood Duck | Aix sponsa | Ducks, Geese, and Swans | 300 | Apr (past peak) |
| 18 | Yellow-rumped Warbler | Setophaga coronata | New World Warblers | 292 | Apr (past peak) |
| 19 | Bay-breasted Warbler | Setophaga castanea | New World Warblers | 291 | Sep (peak) |
| 20 | Green Heron | Butorides virescens | Herons, Egrets, and Bitterns | 276 | Aug (past peak) |
| 21 | Nashville Warbler | Leiothlypis ruficapilla | New World Warblers | 273 | Sep (peak) |
| 22 | Northern Flicker | Colaptes auratus | Woodpeckers | 264 | Apr (past peak) |
| 23 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 254 | Apr (past peak) |
| 24 | Swainson's Thrush | Catharus ustulatus | Thrushes | 251 | Sep (peak) |
| 25 | Black-throated Green Warbler | Setophaga virens | New World Warblers | 245 | May (past peak) |
| 26 | American Redstart | Setophaga ruticilla | New World Warblers | 239 | May (past peak) |
| 27 | Mute Swan | Cygnus olor | Ducks, Geese, and Swans | 236 | May (past peak) |
| 28 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 223 | Apr (past peak) |
| 29 | House Sparrow | Passer domesticus | Old World Sparrows | 222 | Apr (past peak) |
| 30 | Turkey Vulture | Cathartes aura | New World Vultures | 218 | Apr (past peak) |
| 31 | Magnolia Warbler | Setophaga magnolia | New World Warblers | 215 | May (past peak) |
| 32 | Sanderling | Calidris alba | Sandpipers and Allies | 212 | Sep (peak) |
| 33 | Pileated Woodpecker | Dryocopus pileatus | Woodpeckers | 195 | May (past peak) |
| 34 | Common Yellowthroat | Geothlypis trichas | New World Warblers | 186 | May (past peak) |
| 35 | Common Merganser | Mergus merganser | Ducks, Geese, and Swans | 178 | May (past peak) |
| 36 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 176 | Jan (past peak) |
| 37 | American Robin | Turdus migratorius | Thrushes | 171 | Apr (past peak) |
| 38 | Blackpoll Warbler | Setophaga striata | New World Warblers | 166 | Sep (peak) |
| 39 | White-throated Sparrow | Zonotrichia albicollis | New World Sparrows | 163 | Apr (past peak) |
| 40 | Red-eyed Vireo | Vireo olivaceus | Vireos, Shrike-Babblers, and Erpornis | 161 | May (past peak) |
| 41 | White-breasted Nuthatch | Sitta carolinensis | Nuthatches | 158 | Apr (past peak) |
| 42 | Eastern Phoebe | Sayornis phoebe | Tyrant Flycatchers | 149 | Apr (past peak) |
| 43 | Cape May Warbler | Setophaga tigrina | New World Warblers | 149 | May (past peak) |
| 44 | Palm Warbler | Setophaga palmarum | New World Warblers | 145 | May (past peak) |
| 45 | Rose-breasted Grosbeak | Pheucticus ludovicianus | Cardinals and Allies | 142 | May (past peak) |
| 46 | Eastern Wood-Pewee | Contopus virens | Tyrant Flycatchers | 139 | May (past peak) |
| 47 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 139 | May (past peak) |
| 48 | Trumpeter Swan | Cygnus buccinator | Ducks, Geese, and Swans | 134 | Jun (past peak) |
| 49 | Northern Parula | Setophaga americana | New World Warblers | 134 | May (past peak) |
| 50 | Black-and-white Warbler | Mniotilta varia | New World Warblers | 132 | May (past peak) |