August is the hottest, most humid stretch of the Louisiana year, the height of hurricane season, when afternoon storms tower over the marshes. Yet fall migration is already building — hummingbirds surge, shorebirds throng the coast, and the gardener turns to planting the second great growing season.
Week by week in August
July 30 – August 5
- Hummingbirds surge at coastal feeders fueling for the Gulf crossing, and Mississippi Kites gather in pre-migration flocks.
- Set out tomato and pepper transplants for the fall crop and start broccoli and cabbage transplants in flats.
- Cloudless sulphurs begin to build into their great southward fall flight through the coastal parishes.
August 6–12
- The Perseid meteor shower peaks around August 12, the year's most popular shower, sending bright fireballs across the sky after midnight.
- Blazing star and the first goldenrod and fall asters begin, and the swamp mallow flames along the bayou edges.
- Figs are at their peak and the first muscadines and scuppernongs arrive as Gulf shrimp lands fresh at the docks.
August 13–19
- Southbound shorebirds peak in the ricelands, and the first southbound warblers trickle through the coastal woods.
- The fall planting window opens — set out tomato and pepper transplants and sow beans and squash, shading tender seedlings from the sun.
- Some sweetgum and black gum drop scorched leaves early in the dry heat, a false hint of the fall still weeks away.
August 20–26
- The first wintering Blue-winged and Green-winged Teal arrive in the marshes, the vanguard of the great waterfowl return.
- Goldenrod begins to gild the prairies and cheniers as rain lilies burst up after the August thunderstorms.
- Late summer abundance holds — okra, southern peas, peppers, melons, and the season's sweetest figs and muscadines.
August 27 – September 2
- Ruby-throated Hummingbirds build toward their roaring peak at coastal gardens as the first wintering Rufous Hummingbirds appear.
- Monarch breeding produces the migratory generation, and the cloudless sulphur flight streams through the coastal parishes.
- Set out cole-crop transplants and sow fall greens, lettuce, and root crops as the worst heat begins to ease.
Birds This Month
August quietly turns Louisiana toward fall, with migration building through the heat. Southbound shorebirds peak on the coast and in the ricelands — Pectoral, Stilt, Least, and Semipalmated Sandpipers, Lesser and Greater Yellowlegs, Long-billed Dowitchers, and Black-necked Stilts crowd the mudflats and impoundments of Cameron Prairie and the coastal refuges. The first southbound warblers — Yellow, Prothonotary, Louisiana Waterthrush, and American Redstart — trickle through the coastal woods.
The gardens fill with Ruby-throated Hummingbirds fueling up for the Gulf crossing, drawn to cardinal flower, trumpet creeper, salvias, and feeders — the surge builds toward September. Mississippi Kites gather in pre-migration flocks over the bottomlands, and Wood Storks and Roseate Spoonbills disperse widely across the swamps and ponds in post-breeding wandering. The marsh rookeries empty as the young egrets, herons, and ibis scatter, while Brown Pelicans, the state bird, and terns still work the coast and the barrier islands.
What's Blooming
August's bloom in Louisiana belongs to the toughest heat-lovers and the first hints of fall. The crape myrtles still flower along the streets, and the wetlands flame with cardinal flower and the great pink and white swamp mallow (rose mallow) hibiscus along the bayous and marsh edges. The American lotus raises its pale flowers from the backwaters, and the passionflower (maypop) opens along the fencerows.
The roadsides and prairie remnants glow with late-summer wildflowers — blazing star (gayfeather), ironweed, rosinweed, partridge pea, snow-on-the-prairie, and the first goldenrod and fall asters beginning. Gardens carry the heat-proof annuals — zinnias, pentas, lantana, vinca, cosmos, melampodium — and the tropical plumeria, angel's trumpet, hibiscus, and firebush that draw the hummingbirds. In the wet ditches, the white spider lilies linger, and the season's first rain lilies burst up overnight after the heavy August thunderstorms.
Garden This Month
August is when the Louisiana gardener pivots to the second great growing season — the fall garden — even as the summer heat peaks. This is the prime window to set out tomato, pepper, and eggplant transplants for a fall harvest before the first frost (which is months away in this long season), and to direct-sow snap beans, lima beans, squash, cucumbers, and sweet corn for fall. Start broccoli, cabbage, cauliflower, and collard transplants in flats or a shaded nursery bed for setting out in September.
Keep the summer producers — okra, southern peas, sweet potatoes, eggplant, and peppers — watered and harvested. Water deeply in the early morning, mulch heavily, and shade tender fall transplants from the brutal afternoon sun until they establish. Stay ahead of the season's heavy pest pressure — spider mites, stink bugs, caterpillars, nematodes, and fungal disease — and the explosive late-summer weeds, fire ants, and mosquitoes. Order cool-season seed, and watch the tropics: August is peak hurricane season, so secure the garden and have a storm plan.
Zone 9a (Acadiana & central prairie): the fall planting window opens. Set out tomato, pepper, and eggplant transplants for a fall crop, direct-sow snap beans, squash, and cucumbers late in the month, and keep the summer producers watered.
Zone 9b (lower delta & New Orleans): begin the fall garden as the worst heat eases. Plant tomato and pepper transplants in part shade, sow beans and squash, and start broccoli and cabbage transplants indoors for fall.
What's at the Farmers Market
August keeps Louisiana markets full of summer's last abundance, with the heat and storms wearing on. Gulf shrimp lands fresh at the coastal docks as the seasons overlap, and the late summer produce holds strong at the Crescent City, Red Stick, and Lafayette markets.
The stalls carry okra, southern peas, eggplant, bell and hot peppers, summer squash, cucumbers, the last sweet corn, and the season's watermelons and cantaloupes at their sweetest. Fresh figs are at their peak, and the first muscadines and scuppernongs arrive, alongside the last summer tomatoes, local honey, eggs, and cut flowers. Choose figs soft, plump, and just split, handling them gently and using them within a day or two. Pick muscadines fragrant and fully colored, select melons heavy for their size with a deep hollow thump, and choose Gulf shrimp firm and translucent with a clean sea smell, keeping them on ice and using within a day or two.
Night Sky This Month
August's warm, humid Louisiana nights bring the year's most famous meteor show and the summer Milky Way at its highest. The darkest escapes from the city glow remain the open marshes of Sabine and Cameron Prairie NWRs, the Acadiana ricelands, the pinelands of Kisatchie National Forest, and the wide Atchafalaya — the open, unlit horizons give the best chance under hazy skies. The Baton Rouge Astronomical Society, Pontchartrain Astronomy Society, and the LIGO Science Education Center near Livingston run summer programs.
The Perseid meteor shower peaks around August 12, the year's most popular shower, sending swift bright meteors and fireballs across the sky after midnight from a dark site. Overhead the Summer Triangle of Vega, Deneb, and Altair rides high, with the Milky Way arching from Sagittarius and Scorpius in the south up through Cygnus. The dark Great Rift splits the glowing band overhead. The printable Louisiana night-sky guide gives this year's exact Perseid peak date, the Moon phase that will help or hinder it, and the best dark-sky sites near you.
Butterflies & Pollinators
August keeps Louisiana butterflies abundant, especially around well-watered gardens and the blooming wetlands. The swallowtails fly strong — eastern tiger, black, pipevine, giant, spicebush, and zebra — alongside abundant gulf fritillary, variegated fritillary, cloudless sulphur, little yellow, sleepy orange, and the brushfoots common buckeye, red-spotted purple, viceroy, and the hackberry and tawny emperors.
The cloudless sulphurs begin to build into their great southward fall flight, streaming through the coastal parishes. Resident monarchs continue breeding on the milkweeds, the last generation before the migratory generation that will head for Mexico. The grass skippers swarm the late-summer nectar, and butterflies crowd the swamp mallow, cardinal flower, ironweed, and the first goldenrod. A shallow puddling spot and well-watered lantana, pentas, and zinnias keep the garden humming through the heat. Now is the time to ensure nectar plants are blooming for the coming fall migration surge.
What to plant for them is in the Louisiana native plants guide
Trees This Month
August holds Louisiana's forests in tired, deep summer green, with the first subtle hints of the turn to come. The crape myrtles still bloom along the streets, and the bottomland and swamp canopies stand full but dust-dulled in the heat. Some sweetgum, sycamore, and black gum (tupelo) begin to drop scorched and yellowing leaves early in dry spells — a false hint of the fall still weeks away.
In the swamps, the bald cypress, the state tree, and the water tupelo stand over the low summer water of the Atchafalaya, their cones and dark fruit developing. The native fruits ripen for the wildlife — persimmons softening, muscadines and scuppernongs coloring on the vines, and the swamp red bay and black cherry fruiting. The northern pinelands shed needles in the heat, and the live oaks of the coast and bayous hold dark green. Watch the tropics: a late-summer hurricane can strip and reshape the coastal live-oak and cypress forests in a single storm.
The Louisiana native plants guide covers what grows with them
Weather & Daylight
Across Louisiana, a typical August day averages a high near 92°F and a low near 72°F, with about 5.1 inches of precipitation — statewide averages from the 1991–2020 U.S. climate normals.
Sweltering afternoons near 92 degrees linger into muggy nights, the air heavy with moisture and regular downpours.
| Average high | 92°F |
|---|---|
| Average low | 72°F |
| Precipitation | 5.1 in |
| Sunrise (mid-month) | 6:33 CT |
| Sunset (mid-month) | 19:51 CT |
Figures are statewide averages over the 1991–2020 U.S. climate normals; local conditions vary with elevation and distance from the coast. Sunrise and sunset are computed for a midstate point on the 15th (CT).
Next month's version of this page, by email
One short note when Louisiana's next month turns — what's arriving, blooming, and worth a night outside.
Go deeper with the Louisiana guides
The complete Louisiana birding, native-plant, and night-sky references — or the whole year, week by week, in one book.
Same month elsewhere: August in Maine · August in Maryland · August in Massachusetts