60 butterflies were recorded flying in Mississippi in September in our iNaturalist sample; 10 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top butterflies in September

Gulf Fritillary

Common Buckeye

Monarch

Cloudless Sulphur

Long-tailed Skipper

Eastern Tiger Swallowtail

Viceroy
Hackberry Emperor

Fiery Skipper

Pipevine Swallowtail

Palamedes Swallowtail

Spicebush Swallowtail
All butterflies flying in Mississippi in September
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Gulf Fritillary | Dione vanillae | Brush-footed Butterflies | 555 | Oct (rising) |
| 2 | Common Buckeye | Junonia coenia | Brush-footed Butterflies | 347 | Oct (rising) |
| 3 | Monarch | Danaus plexippus | Brush-footed Butterflies | 202 | Oct (rising) |
| 4 | Cloudless Sulphur | Phoebis sennae | Whites, Yellows, and Sulphurs | 182 | Sep (peak) |
| 5 | Long-tailed Skipper | Urbanus proteus | Skippers | 160 | Oct (rising) |
| 6 | Eastern Tiger Swallowtail | Papilio glaucus | Swallowtails and Parnassians | 153 | Aug (past peak) |
| 7 | Viceroy | Limenitis archippus | Brush-footed Butterflies | 128 | Sep (peak) |
| 8 | Hackberry Emperor | Asterocampa celtis | Brush-footed Butterflies | 115 | Aug (past peak) |
| 9 | Fiery Skipper | Hylephila phyleus | Skippers | 114 | Sep (peak) |
| 10 | Pipevine Swallowtail | Battus philenor | Swallowtails and Parnassians | 96 | Aug (past peak) |
| 11 | Palamedes Swallowtail | Papilio palamedes | Swallowtails and Parnassians | 95 | Jul (past peak) |
| 12 | Spicebush Swallowtail | Papilio troilus | Swallowtails and Parnassians | 91 | Aug (past peak) |
| 13 | Eastern Giant Swallowtail | Heraclides cresphontes | Swallowtails and Parnassians | 80 | Aug (past peak) |
| 14 | Pearl Crescent | Phyciodes tharos | Brush-footed Butterflies | 77 | Jul (past peak) |
| 15 | Little Yellow | Eurema lisa | Whites, Yellows, and Sulphurs | 74 | Sep (peak) |
| 16 | Ocola Skipper | Panoquina ocola | Skippers | 71 | Oct (rising) |
| 17 | Red-banded Hairstreak | Calycopis cecrops | Gossamer-winged Butterflies | 66 | Mar (past peak) |
| 18 | Gray Hairstreak | Strymon melinus | Gossamer-winged Butterflies | 63 | Jul (past peak) |
| 19 | Sleepy Orange | Eurema nicippe | Whites, Yellows, and Sulphurs | 60 | Aug (past peak) |
| 20 | Question Mark | Polygonia interrogationis | Brush-footed Butterflies | 59 | Jul (past peak) |
| 21 | Clouded Skipper | Lerema accius | Skippers | 56 | Oct (rising) |
| 22 | Variegated Fritillary | Euptoieta claudia | Brush-footed Butterflies | 52 | Oct (rising) |
| 23 | Carolina Satyr | Hermeuptychia sosybius | Brush-footed Butterflies | 51 | Mar (past peak) |
| 24 | Silver-spotted Skipper | Epargyreus clarus | Skippers | 51 | Aug (past peak) |
| 25 | Painted Lady | Vanessa cardui | Brush-footed Butterflies | 50 | Sep (peak) |
| 26 | Red-spotted Admiral | Limenitis arthemis | Brush-footed Butterflies | 42 | Aug (past peak) |
| 27 | Tawny Emperor | Asterocampa clyton | Brush-footed Butterflies | 39 | Sep (peak) |
| 28 | Tropical Checkered-Skipper | Burnsius oileus | Skippers | 28 | Oct (rising) |
| 29 | Whirlabout | Hedone vibex | Skippers | 28 | Aug (past peak) |
| 30 | Phaon Crescent | Phyciodes phaon | Brush-footed Butterflies | 27 | Sep (peak) |
| 31 | Horace's Duskywing | Erynnis horatius | Skippers | 26 | May (past peak) |
| 32 | Red Admiral | Vanessa atalanta | Brush-footed Butterflies | 23 | Apr (past peak) |
| 33 | Eastern Tailed-Blue | Everes comyntas | Gossamer-winged Butterflies | 23 | May (past peak) |
| 34 | Common Wood-Nymph | Cercyonis pegala | Brush-footed Butterflies | 20 | Jul (past peak) |
| 35 | Great Purple Hairstreak | Atlides halesus | Gossamer-winged Butterflies | 20 | Sep (peak) |
| 36 | Black Swallowtail | Papilio polyxenes | Swallowtails and Parnassians | 19 | Jun (past peak) |
| 37 | Southern Skipperling | Oarisma minima | Skippers | 16 | Sep (peak) |
| 38 | Dainty Sulphur | Nathalis iole | Whites, Yellows, and Sulphurs | 15 | Sep (peak) |
| 39 | Queen | Danaus gilippus | Brush-footed Butterflies | 14 | Aug (past peak) |
| 40 | Southern Pearly-eye | Lethe portlandia | Brush-footed Butterflies | 12 | Mar (past peak) |
| 41 | Zabulon Skipper | Lon zabulon | Skippers | 12 | Apr (past peak) |
| 42 | Southern Broken-Dash | Polites otho | Skippers | 12 | Aug (past peak) |
| 43 | Southern Dogface | Zerene cesonia | Whites, Yellows, and Sulphurs | 11 | Jul (past peak) |
| 44 | Zebra Longwing | Heliconius charithonia | Brush-footed Butterflies | 10 | Oct (rising) |
| 45 | American Snout | Libytheana carinenta | Brush-footed Butterflies | 10 | May (past peak) |
| 46 | Least Skipper | Ancyloxypha numitor | Skippers | 9 | Aug (past peak) |
| 47 | Little Metalmark | Calephelis virginiensis | Metalmark Butterflies | 9 | Jul (past peak) |
| 48 | American Lady | Vanessa virginiensis | Brush-footed Butterflies | 8 | May (past peak) |
| 49 | Eastern Gemmed-Satyr | Cyllopsis gemma | Brush-footed Butterflies | 8 | Mar (past peak) |
| 50 | Dun Skipper | Euphyes vestris | Skippers | 7 | Jul (past peak) |