August is late summer in Ohio — the markets peak with corn, tomatoes, and peaches, the goldenrod and ironweed take over the fields, and the fall bird migration quietly begins. Warm nights bring the Perseid meteors and the rich summer Milky Way.
Week by week in August
July 30 – August 5
- Peaches arrive from Ohio's orchards alongside peak sweet corn and tomatoes — the most abundant market weeks of the year.
- Goldenrod begins to gild the fields and the first New England asters open as the late-summer composites take over.
- The Perseid meteors begin building toward their mid-month peak as the rich summer Milky Way fills the sky.
August 6–12
- The Perseid meteor shower peaks around August 12 — one of the year's best, with dozens an hour after midnight from a dark site.
- The monarch migration buildup begins as the 'super generation' fuels up on goldenrod for the long flight to Mexico.
- Common nighthawks stream south in loose flocks at dusk and ruby-throated hummingbirds reach their peak numbers.
August 13–19
- The most abundant market weeks roll on — corn, tomatoes, peaches, peppers, melons, and the first early apples.
- Jewelweed glows orange in damp ditches, a key late nectar source for the migrating hummingbirds.
- Sow fall spinach, lettuce, and radishes, and set out cole-crop transplants for an autumn harvest.
August 20–26
- Common buckeyes with their bold eyespots increase in open ground as painted ladies and red admirals can turn numerous.
- Purple martins gather in huge pre-migration roosts and shorebirds crowd the drawn-down Lake Erie mudflats.
- Black gum flares the first premature crimson, a preview of the fall color to come.
August 27 – September 2
- Goldenrod and New England aster paint the fields gold and purple — the season's most important nectar source for migrants.
- Summer's last corn and tomatoes overlap the first apples, winter squash, and pumpkins as the harvest pivots to fall.
- Adult and juvenile warblers trickle south through the woodlots in their confusing fall plumages.
Birds This Month
August is when fall migration quietly begins in Ohio, even as summer holds. Shorebird migration is in full swing on Lake Erie mudflats and inland wetlands — least, semipalmated, and pectoral sandpipers, lesser yellowlegs, killdeer, and the chance of rarer species crowd the flats at Magee Marsh, Ottawa, and reservoir margins as water levels drop. Adult and then juvenile warblers begin trickling south through the woodlots, harder to identify now in their drab fall plumage.
Ruby-throated hummingbirds are at peak numbers, fattening at feeders and jewelweed before their long journey; common nighthawks stream south in loose flocks at dusk late in the month, a classic Ohio August spectacle. Purple martins gather in huge pre-migration roosts, and barn swallows and chimney swifts mass over towns. Songbird singing has largely ceased, but the woods and fields are full of quietly moving young birds and southbound migrants. Keep hummingbird feeders full and fresh through the month.
What's Blooming
August shifts Ohio's bloom toward the great late-summer composites. Goldenrod begins to gild the fields and roadsides in a dozen species, and ironweed raises its deep purple over wet meadows. Joe-Pye weed, boneset, tall coreopsis, cup plant, woodland and prairie sunflowers, blazing star, and the first New England asters fill the prairies and grassland restorations. Along streams, the brilliant red cardinal flower and the blue great blue lobelia bloom in the shade.
Roadsides foam with Queen Anne's lace, chicory, and the orange-and-yellow jewelweed in damp ditches — a key late nectar source for hummingbirds. Gardens still hold phlox, black-eyed Susans, coneflowers, zinnias, sunflowers, and the first sedums. These late-summer flowers are crucial fuel for migrating monarchs and hummingbirds, so the prairie plantings buzz with pollinators right through the warm, humid days of August.
Garden This Month
August is peak harvest in the Ohio garden, and the work is keeping up with it. Pick tomatoes, peppers, eggplant, beans, summer squash, cucumbers, sweet corn, and melons at their ripe best, and preserve or share the surplus. Keep watering deeply and consistently in late-summer heat to prevent cracking and blossom-end rot, and stay on top of Japanese beetles, hornworms, stink bugs, and late blight in humid spells.
This is the key window for the fall garden: sow spinach, lettuce, arugula, radishes, turnips, and carrots, and set out transplants of broccoli, cabbage, kale, collards, and Brussels sprouts for an autumn and early-winter harvest. Pull spent, tired summer crops and replant the space, and keep harvesting and pinching herbs. In the flower garden, deadhead and water container plantings daily, and start planning where fall bulbs will go.
Zone 5b (snowbelt & northeast): with the shortest season, sow fast fall greens, spinach, and radishes early in the month and set out cole-crop transplants promptly to mature before the first frost arrives.
Zone 6a (central & northern Ohio): peak harvest continues — keep picking and preserving, and finish sowing fall crops of spinach, lettuce, radishes, and turnips, plus setting out broccoli, kale, and cabbage transplants.
Zone 6b (southwest & warmer valleys): the longer season gives more room for fall plantings; keep watering through late-summer heat and sow successions of greens and root crops into early September.
What's at the Farmers Market
August is the most abundant market month of the year in Ohio. Sweet corn and tomatoes are at their absolute peak, joined by peaches (Ohio's orchards in full swing), peppers, eggplant, summer squash, cucumbers, green beans, potatoes, onions, melons, and the first sweet peppers and tomatillos. Blackberries, blueberries, and the first early apples ripen, and sweet corn stands line the roads.
Cut flowers (sunflowers, zinnias), herbs, eggs, honey, and baked goods fill the tables. Choose peaches that are fragrant and give slightly at the seam — ripen hard ones on the counter, then refrigerate once soft. Buy sweet corn the same day you'll eat it, and store tomatoes at room temperature, stem-side down. Pick heavy, sweet-smelling melons. The markets are bursting, the prices are at their summer lowest, and this is the moment to buy in quantity to preserve for winter.
Night Sky This Month
August is a highlight of the Ohio stargazing year, thanks to the Perseid meteor shower, which peaks around August 12 and is one of the year's best — warm nights and up to dozens of meteors an hour radiating from Perseus in the northeast make it the most-watched shower of all, especially after midnight from a dark site. The summer Milky Way is at its richest, arching from Sagittarius and Scorpius in the south up through the Summer Triangle overhead.
Vega, Deneb, and Altair ride high, and the great star clouds toward the galactic center reward binoculars from dark country. The Hocking Hills, Shawnee State Forest, and the rural southeast give Ohio's darkest skies for the Perseids and the Milky Way. For this year's exact Perseid peak, the moon's interference, and planet positions over your part of Ohio, consult the printable Ohio night-sky guide.
Butterflies & Pollinators
August keeps Ohio's butterfly numbers high and begins the season's most dramatic chapter — the monarch migration buildup. The late-summer generation now emerging is the special 'super generation' that will not breed right away but will instead fuel up on goldenrod, ironweed, and other late flowers and begin the long flight to Mexico, funneling along the Lake Erie shore in coming weeks. Tag-and-release programs at the lakeshore track them.
The summer cast is still strong: eastern tiger, black, and spicebush swallowtails, great spangled fritillaries, red-spotted purples, buckeyes with their bold eyespots increasing now, and clouds of sulphurs, pearl crescents, and skippers over fields and gardens. Painted ladies and red admirals can be numerous. Plant and protect late-blooming natives like goldenrod, aster, and Joe-Pye weed — they are the critical fuel that powers the monarchs' southward journey.
Trees This Month
August finds Ohio's trees in deep, slightly tired late-summer green, the leaves dusty and sometimes drought-stressed in dry years. The big story is ripening fruit and nuts. The pawpaw — Ohio's largest native fruit — ripens in the understory of rich bottomland woods late in the month, and wild black cherry drops its small dark fruit for the wildlife. Acorns swell and the earliest begin to fall from the oaks.
The spiny husks on the Ohio buckeye are nearly full size, black walnut and hickory nuts fatten, and the winged samaras hang ready on maples and ashes. A few stressed or early trees — black gum (tupelo), sumac, and the odd red maple — flush the first premature red of the coming fall, a preview of the color to come. Eastern hemlock holds the cool gorges dark and green through the heat.
Weather & Daylight
Across Ohio, a typical August day averages a high near 83°F and a low near 61°F, with about 3.5 inches of precipitation — statewide averages from the 1991–2020 U.S. climate normals.
Still heavy and warm at highs near 83, though nights near 61 hint that the sharpest heat has passed.
| Average high | 83°F |
|---|---|
| Average low | 61°F |
| Precipitation | 3.5 in |
| Sunrise (mid-month) | 6:42 ET |
| Sunset (mid-month) | 20:30 ET |
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 (ET).
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Same month elsewhere: August in Oklahoma · August in Oregon · August in Pennsylvania