60 birds were recorded seen in Alaska 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

Bald Eagle

Black-legged Kittiwake
Glaucous-winged Gull

Short-billed Gull
Black-billed Magpie

Spruce Grouse

Mallard

Common Raven

Steller's Jay
Sandhill Crane
American Wigeon
Trumpeter Swan
All birds seen in Alaska in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Bald Eagle | Haliaeetus leucocephalus | Hawks, Eagles, and Kites | 617 | Jul (past peak) |
| 2 | Black-legged Kittiwake | Rissa tridactyla | Gulls, Terns, and Skimmers | 279 | Jul (past peak) |
| 3 | Glaucous-winged Gull | Larus glaucescens | Gulls, Terns, and Skimmers | 254 | Jul (past peak) |
| 4 | Short-billed Gull | Larus brachyrhynchus | Gulls, Terns, and Skimmers | 238 | Jul (past peak) |
| 5 | Black-billed Magpie | Pica hudsonia | Crows, Jays, and Magpies | 237 | Jul (past peak) |
| 6 | Spruce Grouse | Canachites canadensis | Pheasants, Grouse, and Allies | 216 | Sep (peak) |
| 7 | Mallard | Anas platyrhynchos | Ducks, Geese, and Swans | 194 | May (past peak) |
| 8 | Common Raven | Corvus corax | Crows, Jays, and Magpies | 188 | Jul (past peak) |
| 9 | Steller's Jay | Cyanocitta stelleri | Crows, Jays, and Magpies | 160 | Aug (past peak) |
| 10 | Sandhill Crane | Antigone canadensis | Cranes | 151 | May (past peak) |
| 11 | American Wigeon | Mareca americana | Ducks, Geese, and Swans | 147 | May (past peak) |
| 12 | Trumpeter Swan | Cygnus buccinator | Ducks, Geese, and Swans | 142 | Jun (past peak) |
| 13 | Glaucous Gull | Larus hyperboreus | Gulls, Terns, and Skimmers | 129 | Jun (past peak) |
| 14 | Green-winged Teal | Anas crecca | Ducks, Geese, and Swans | 113 | May (past peak) |
| 15 | Common Merganser | Mergus merganser | Ducks, Geese, and Swans | 112 | Jul (past peak) |
| 16 | Common Murre | Uria aalge | Auks, Murres, and Puffins | 111 | Jul (past peak) |
| 17 | Harlequin Duck | Histrionicus histrionicus | Ducks, Geese, and Swans | 110 | Jun (past peak) |
| 18 | Song Sparrow | Melospiza melodia | New World Sparrows | 107 | Jun (past peak) |
| 19 | Canada Jay | Perisoreus canadensis | Crows, Jays, and Magpies | 103 | Jun (past peak) |
| 20 | Pelagic Cormorant | Urile pelagicus | Cormorants and Shags | 96 | Jun (past peak) |
| 21 | Black-capped Chickadee | Poecile atricapillus | Tits, Chickadees, and Titmice | 90 | Jul (past peak) |
| 22 | American Crow | Corvus brachyrhynchos | Crows, Jays, and Magpies | 89 | Jul (past peak) |
| 23 | Belted Kingfisher | Megaceryle alcyon | Kingfishers | 86 | Aug (past peak) |
| 24 | Dark-eyed Junco | Junco hyemalis | New World Sparrows | 77 | Jun (past peak) |
| 25 | Northern Shoveler | Spatula clypeata | Ducks, Geese, and Swans | 77 | May (past peak) |
| 26 | California Gull | Larus californicus | Gulls, Terns, and Skimmers | 73 | Sep (peak) |
| 27 | Surf Scoter | Melanitta perspicillata | Ducks, Geese, and Swans | 73 | May (past peak) |
| 28 | Savannah Sparrow | Passerculus sandwichensis | New World Sparrows | 71 | Jun (past peak) |
| 29 | Great Blue Heron | Ardea herodias | Herons, Egrets, and Bitterns | 70 | Aug (past peak) |
| 30 | Golden-crowned Sparrow | Zonotrichia atricapilla | New World Sparrows | 70 | Jun (past peak) |
| 31 | Tufted Puffin | Fratercula cirrhata | Auks, Murres, and Puffins | 69 | Aug (past peak) |
| 32 | Northern Pintail | Anas acuta | Ducks, Geese, and Swans | 68 | May (past peak) |
| 33 | Red-necked Grebe | Podiceps grisegena | Grebes | 66 | Jun (past peak) |
| 34 | American Robin | Turdus migratorius | Thrushes | 66 | Jun (past peak) |
| 35 | Canada Goose | Branta canadensis | Ducks, Geese, and Swans | 63 | Jun (past peak) |
| 36 | Red-breasted Nuthatch | Sitta canadensis | Nuthatches | 63 | Aug (past peak) |
| 37 | Greater Yellowlegs | Tringa melanoleuca | Sandpipers and Allies | 58 | Aug (past peak) |
| 38 | Varied Thrush | Ixoreus naevius | Thrushes | 58 | Jun (past peak) |
| 39 | American Herring Gull | Larus smithsonianus | Gulls, Terns, and Skimmers | 58 | Jul (past peak) |
| 40 | Bonaparte's Gull | Chroicocephalus philadelphia | Gulls, Terns, and Skimmers | 52 | Jul (past peak) |
| 41 | Northern Yellow Warbler | Setophaga aestiva | New World Warblers | 50 | Jun (past peak) |
| 42 | American Dipper | Cinclus mexicanus | Dippers | 49 | Jun (past peak) |
| 43 | Common Loon | Gavia immer | Loons | 47 | Jun (past peak) |
| 44 | Black Turnstone | Arenaria melanocephala | Sandpipers and Allies | 46 | Aug (past peak) |
| 45 | American Tree Sparrow | Spizelloides arborea | New World Sparrows | 46 | Jun (past peak) |
| 46 | Ruby-crowned Kinglet | Corthylio calendula | Kinglets | 46 | May (past peak) |
| 47 | Lapland Longspur | Calcarius lapponicus | Longspurs and Snow Buntings | 44 | Jun (past peak) |
| 48 | Greater White-fronted Goose | Anser albifrons | Ducks, Geese, and Swans | 42 | May (past peak) |
| 49 | Greater Scaup | Aythya marila | Ducks, Geese, and Swans | 41 | Jun (past peak) |
| 50 | Orange-crowned Warbler | Leiothlypis celata | New World Warblers | 41 | Jun (past peak) |