Washington, D.C. Nature Guide: August 2026
Data updated: August 2026Sources & method · Corrections
August is late summer in the District — fall migration quietly begins as shorebirds and the first warblers move through, the meadows blaze with goldenrod and ironweed, and the markets peak with tomatoes, peaches, melons, and Chesapeake crabs.
Week by week in August
July 30 – August 5
- Returning warblers begin trickling back through Rock Creek, and common nighthawks start their evening migration flights.
- Swamp rose mallow raises huge pink hibiscus flowers in the Kenilworth and Anacostia tidal marshes.
- Transplant fall broccoli, cabbage, and kale and direct-sow autumn greens under shade cloth.
August 6–12
- The Perseid meteor shower peaks around August 12, dozens of bright, fast meteors per hour from the northeast.
- The fall composites take over — goldenrod, ironweed, and the first New England asters blaze across the meadows.
- Tomatoes, peaches, and the first watermelons and cantaloupes mark the deep peak of the harvest.
August 13–19
- Southbound shorebirds work the exposed mudflats, and eastern kingbirds and swallows gather in pre-migratory flocks over the rivers.
- Monarchs reach their summer peak and the migratory generation begins to form on the late goldenrod.
- Black gum and sourwood show their first early scarlet, the District's earliest hint of fall color.
August 20–26
- Loose flocks of common nighthawks course for insects over city neighborhoods at dusk, a classic late-August spectacle.
- Set out fall transplants and sow more spinach and lettuce as the season pivots toward autumn.
- Late peaches and the first apples and winter squash begin to overlap at the markets.
August 27 – September 2
- The first returning warblers thicken in Rock Creek, and ruby-throated hummingbirds peak at the blooming jewelweed.
- Goldenrod and asters blaze across the Arboretum meadows, the crucial late nectar for migrating monarchs.
- Common buckeyes become abundant and the southbound monarch passage begins to build.
Birds This Month
August opens fall migration in the District even as summer lingers. Southbound shorebirds — least, semipalmated, and solitary sandpipers, lesser yellowlegs, and killdeer — work the exposed Anacostia and Kenilworth mudflats, and the first returning warblers trickle back through Rock Creek — worm-eating, American redstart, black-and-white, and northern waterthrush. Eastern kingbirds and swallows gather in pre-migratory flocks over the rivers.
Resident birds are quieter and molting, but ruby-throated hummingbirds are conspicuous at jewelweed and cardinal flower, building up for their journey south. Common nighthawks begin their evening migration flights over the city late in the month, and chimney swifts mass before fall. On the rivers, ospreys, Bald Eagles, herons, and egrets remain easy to find.
This month's tip: watch the evening sky over your neighborhood late in the month for loose flocks of southbound nighthawks coursing for insects — a classic late-August D.C. spectacle.
What's Blooming
August turns the District's meadows and wetlands gold and purple. The fall composites take over: goldenrods of several species, New York and New England asters, ironweed, Joe-Pye weed, boneset, sneezeweed, and wingstem blaze across the Arboretum meadows, Kenilworth margins, and roadsides. Cardinal flower flames scarlet along the Anacostia and the C&O Canal, drawing hummingbirds, and jewelweed hangs its orange spurred blooms in the moist woods.
At Kenilworth Aquatic Gardens the last lotus and waterlilies finish their long bloom, joined by swamp rose mallow raising huge pink hibiscus flowers in the tidal marsh. Sunny fields still hold black-eyed Susan, partridge pea, wild bergamot, mountain mint, and Queen Anne's lace, and the District's gardens glow with late summer phlox, coneflower, and the persistent American Beauty roses.
Garden This Month
August is the District's pivot from harvest to fall planting. The warm-season crops are at full tilt — tomatoes, peppers, eggplant, okra, beans, cucumbers, and squash — but it's now critical to start the fall garden. Transplant the broccoli, cabbage, cauliflower, and kale you started in flats, and direct-sow spinach, lettuce, arugula, turnips, radishes, beets, and carrots for autumn harvest, using shade cloth and steady water to get seedlings up in the heat.
Keep watering deeply and picking daily to extend production and beat the late-summer pest and disease surge in D.C.'s humidity. Pull spent spring crops, refresh beds with compost, and consider a quick cover crop or a second sowing of bush beans. Sow cilantro, dill, and other cool-weather herbs that bolted in spring. Order garlic now for fall planting, and keep the compost pile turning.
Zone 7a (cooler uplands and Rock Creek corridor): transplant fall brassicas and direct-sow spinach, lettuce, kale, and turnips for autumn harvest. Keep tomatoes and peppers watered and picked as they hit full stride.
Zone 7b (warmer downtown and riverside core): the heat island lengthens the season — set out fall transplants under shade cloth, sow more greens, and start succession lettuce and radishes for a long fall harvest.
What's at the Farmers Market
August markets in D.C. hit the deep peak of the harvest. Tomatoes, sweet corn, peppers, eggplant, okra, summer squash, cucumbers, and beans all overflow the stalls, joined by the season's best stone fruit — peaches, plums, and nectarines from Mid-Atlantic orchards — and the first melons, watermelons, and cantaloupes at Eastern Market and the FreshFarm markets.
Blackberries, late blueberries, and figs appear, and Chesapeake blue crabs remain at their summer best. Choose tomatoes that are heavy, fragrant, and yielding, and store at room temperature; pick peaches and melons that smell sweet and give slightly, and ripen firm fruit on the counter; thump a watermelon for a deep, hollow note. For blue crabs, choose lively, heavy ones and keep them cold and damp until you cook them the same day. This is the most abundant market month of the District's year.
The Washington, D.C. native plants guide covers what grows here
Night Sky This Month
August brings the District its most popular meteor night of the year. The Perseid meteor shower peaks around August 12, throwing dozens of bright, fast meteors per hour out of Perseus in the northeast on a dark, moonless night — the most reliable shower for warm-weather watching from open spots like Hains Point, the Mall, or the river overlooks.
The summer sky is at its richest: the Summer Triangle of Vega, Deneb, and Altair stands overhead, Scorpius and the Sagittarius teapot ride the southern horizon, and the summer Milky Way arches through them — visible only from beyond the city's glow. Cygnus the swan flies down the Milky Way with the lovely double star Albireo at its head.
For the Perseids and the Milky Way, drive into rural Maryland or Virginia and let your eyes adapt. The printable Washington, D.C. night-sky guide gives this year's exact Perseid timing and planet positions for the District.
Butterflies & Pollinators
August keeps the District's butterflies abundant and adds the building monarch passage. The swallowtails — eastern tiger, spicebush, zebra, black, and pipevine — still nectar across the gardens and meadows, joined by clouds of silver-spotted and other skippers, great spangled fritillaries, common buckeyes, red admirals, painted and American ladies, cabbage whites, and sulphurs. The fall-blooming ironweed, Joe-Pye weed, and early goldenrod become magnets for nectaring butterflies. Monarchs are at their summer peak, and the migratory generation begins to form — these are the long-lived adults that will fly all the way to Mexico. Watch the Arboretum and Kenilworth meadows for monarchs and fritillaries thick on the late blooms, and for skippers nectaring on mountain mint. Keep the milkweed standing and the late-season nectar plentiful — coneflower, goldenrod, aster, and ironweed fuel the monarchs as they prepare for the great southbound journey.
What to plant for them is in the Washington, D.C. native plants guide
Trees This Month
August holds the District's trees in tired late-summer green, with the first subtle hints of the turn. The crape myrtles are at their long-blooming peak across the city's streets, and the sourwood finishes its white bells as its leaves begin to redden — one of the very first trees to show fall color. Scattered black gum (tupelo) branches flame early scarlet in the wetter woods.
The nut and seed crop ripens toward harvest: acorns fatten on the scarlet, white, and red oaks, hickory nuts and black walnuts swell, and the black gums set their dark blue fruit for migrating birds. Dry late-summer spells can stress city trees and bring early leaf drop from the tulip trees and buckeyes. The riverside sycamores and Mall elms still cast deep shade, and the canopy stands at its last full green before September begins the slow change.
The Washington, D.C. native plants guide covers what grows with them
Weather & Daylight
Across Washington, D.C., a typical August day averages a high near 85°F and a low near 65°F, with about 4.2 inches of precipitation — District-wide averages from the 1991–2020 U.S. climate normals.
Thick, humid heat lingers, mid-80s afternoons and warm mid-60s nights, with storms rolling through almost as often as July.
| Average high | 85°F |
|---|---|
| Average low | 65°F |
| Precipitation | 4.2 in |
| Sunrise (mid-month) | 6:21 ET |
| Sunset (mid-month) | 20:04 ET |
Figures are District-wide 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 (ET). Temperature and precipitation use Maryland District-wide normals (the District has no separate climate series).
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One short note when Washington, D.C.'s next month turns — what's arriving, blooming, and worth a night outside.
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Same month elsewhere: August in Florida · August in Georgia · August in Idaho