60 birds were recorded seen in Louisiana in September in our iNaturalist sample; 2 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top birds in September

Ruby-throated Hummingbird

Great Egret

White Ibis

Black-bellied Whistling-Duck

Great Blue Heron

Anhinga
Common Yellowthroat

Little Blue Heron

Northern Cardinal
Yellow-crowned Night Heron

Green Heron

Northern Mockingbird
All birds seen in Louisiana in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Ruby-throated Hummingbird | Archilochus colubris | Hummingbirds | 378 | Apr (past peak) |
| 2 | Great Egret | Ardea alba | Herons, Egrets, and Bitterns | 352 | Apr (past peak) |
| 3 | White Ibis | Eudocimus albus | Ibises and Spoonbills | 322 | Oct (rising) |
| 4 | Black-bellied Whistling-Duck | Dendrocygna autumnalis | Ducks, Geese, and Swans | 182 | Apr (past peak) |
| 5 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 164 | Apr (past peak) |
| 6 | Anhinga | Anhinga anhinga | Darters | 163 | Dec (rising) |
| 7 | Common Yellowthroat | Geothlypis trichas | New World Warblers | 161 | Oct (rising) |
| 8 | Little Blue Heron | Egretta caerulea | Herons, Egrets, and Bitterns | 156 | Apr (past peak) |
| 9 | Northern Cardinal | Cardinalis cardinalis | Cardinals and Allies | 129 | Apr (past peak) |
| 10 | Yellow-crowned Night Heron | Nyctanassa violacea | Herons, Egrets, and Bitterns | 126 | Apr (past peak) |
| 11 | Green Heron | Butorides virescens | Herons, Egrets, and Bitterns | 125 | Apr (past peak) |
| 12 | Northern Mockingbird | Mimus polyglottos | Mockingbirds and Thrashers | 121 | Apr (past peak) |
| 13 | Mourning Dove | Zenaida macroura | Pigeons and Doves | 108 | Apr (past peak) |
| 14 | Snowy Egret | Egretta thula | Herons, Egrets, and Bitterns | 106 | Apr (past peak) |
| 15 | Eastern Wood-Pewee | Contopus virens | Tyrant Flycatchers | 102 | May (past peak) |
| 16 | Carolina Wren | Thryothorus ludovicianus | Wrens | 99 | Apr (past peak) |
| 17 | Tricolored Heron | Egretta tricolor | Herons, Egrets, and Bitterns | 89 | Apr (past peak) |
| 18 | Laughing Gull | Leucophaeus atricilla | Gulls, Terns, and Skimmers | 89 | Apr (past peak) |
| 19 | Wood Duck | Aix sponsa | Ducks, Geese, and Swans | 87 | Apr (past peak) |
| 20 | Blue Jay | Cyanocitta cristata | Crows, Jays, and Magpies | 86 | Apr (past peak) |
| 21 | Roseate Spoonbill | Platalea ajaja | Ibises and Spoonbills | 86 | Apr (past peak) |
| 22 | Least Sandpiper | Calidris minutilla | Sandpipers and Allies | 83 | Apr (past peak) |
| 23 | Carolina Chickadee | Poecile carolinensis | Tits, Chickadees, and Titmice | 83 | Apr (past peak) |
| 24 | Eastern Bluebird | Sialia sialis | Thrushes | 82 | Apr (past peak) |
| 25 | Summer Tanager | Piranga rubra | Cardinals and Allies | 79 | Apr (past peak) |
| 26 | House Sparrow | Passer domesticus | Old World Sparrows | 77 | Apr (past peak) |
| 27 | Downy Woodpecker | Dryobates pubescens | Woodpeckers | 76 | Apr (past peak) |
| 28 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 74 | Apr (past peak) |
| 29 | Northern Yellow Warbler | Setophaga aestiva | New World Warblers | 72 | Aug (past peak) |
| 30 | Osprey | Pandion haliaetus | Ospreys | 70 | Apr (past peak) |
| 31 | Killdeer | Charadrius vociferus | Plovers and Lapwings | 69 | Apr (past peak) |
| 32 | Northern Waterthrush | Parkesia noveboracensis | New World Warblers | 69 | Sep (peak) |
| 33 | Barred Owl | Strix varia | Typical Owls | 68 | Apr (past peak) |
| 34 | White-eyed Vireo | Vireo griseus | Vireos, Shrike-Babblers, and Erpornis | 66 | Apr (past peak) |
| 35 | Red-shouldered Hawk | Buteo lineatus | Hawks, Eagles, and Kites | 65 | Jan (past peak) |
| 36 | Chimney Swift | Chaetura pelagica | Swifts | 65 | Apr (past peak) |
| 37 | Red-bellied Woodpecker | Melanerpes carolinus | Woodpeckers | 65 | Apr (past peak) |
| 38 | Limpkin | Aramus guarauna | Limpkins | 64 | Mar (past peak) |
| 39 | Eastern Kingbird | Tyrannus tyrannus | Tyrant Flycatchers | 64 | Apr (past peak) |
| 40 | Common Gallinule | Gallinula galeata | Rails, Gallinules, and Coots | 64 | Apr (past peak) |
| 41 | Western Cattle-Egret | Ardea ibis | Herons, Egrets, and Bitterns | 64 | Apr (past peak) |
| 42 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 59 | Apr (past peak) |
| 43 | Cooper's Hawk | Astur cooperii | Hawks, Eagles, and Kites | 59 | Feb (past peak) |
| 44 | House Finch | Haemorhous mexicanus | Finches, Euphonias, and Allies | 58 | Apr (past peak) |
| 45 | Blue-gray Gnatcatcher | Polioptila caerulea | Gnatcatchers and Gnatwrens | 57 | Dec (rising) |
| 46 | Magnolia Warbler | Setophaga magnolia | New World Warblers | 56 | Oct (rising) |
| 47 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 54 | Jan (past peak) |
| 48 | Brown Pelican | Pelecanus occidentalis | Pelicans | 53 | Apr (past peak) |
| 49 | American Redstart | Setophaga ruticilla | New World Warblers | 52 | Oct (rising) |
| 50 | Acadian Flycatcher | Empidonax virescens | Tyrant Flycatchers | 52 | Sep (peak) |