Washington Nature Guide: August 2026
Data updated: August 2026Sources & method · Corrections
August is high summer in Washington — the subalpine meadows hold their peak wildflower glory, the hop harvest scents the Yakima Valley, fall shorebird migration builds on the coast, and the warm, dark nights bring the Perseid meteors over the eastern desert skies.
Week by week in August
July 30 – August 5
- Hop harvest begins in the Yakima Valley, the nation's hop capital, as the first apples and table grapes arrive from the hot eastern valleys.
- Grays Harbor and Bottle Beach fill with returning Western, Least, and Baird's Sandpipers, hunted by Peregrines and Merlins.
- Pearly everlasting and Douglas aster color lowland roadsides as fireweed tops out and goes to fluff, marking late summer.
August 6–12
- The Perseid meteor shower peaks around August 12 — watch the dark northeast after midnight from a site east of the Cascades.
- Peak westside harvest of tomatoes, beans, squash, and corn; make the last fall sowings while warmth still triggers germination.
- Stone fruit floods the stalls — peaches, nectarines, apricots, and plums from Yakima and Wenatchee at their ripe best.
August 13–19
- The highest meadows of Rainier hold their late bloom — magenta paintbrush, aster, and the shaggy seed heads of western anemone.
- East of the Cascades, budding rabbitbrush draws coppers, blues, and the scarce monarchs of the Columbia Basin as they begin drifting south.
- Pacific madrone sheds its outer bark in curling cinnamon-red strips, revealing smooth green beneath on the Puget Sound bluffs.
August 20–26
- Heermann's Gulls and Brown Pelicans push north from California to feed in the Strait of Juan de Fuca.
- Fresh wet hops appear briefly at Yakima farm stands for harvest-season brewing as sweet corn and tomatoes flood the markets.
- Woodland Skippers reach their huge late-summer abundance in westside gardens, the signature butterfly of the season.
August 27 – September 2
- Songbird migrants — warblers, vireos, and flycatchers — move quietly south through the leafy lowlands as fall migration builds.
- Order garlic for October planting and harvest the last of the summer crops as nights begin to cool.
- Rabbitbrush turns the shrub-steppe and roadcuts brilliant gold east of the Cascades, alive with late bees and butterflies.
Birds This Month
August is dominated by fall migration, especially shorebirds. Grays Harbor, Bottle Beach, the Skagit and Samish flats, and the Pacific coast fill with returning Western, Least, and Baird's Sandpipers, dowitchers, Black-bellied and Semipalmated Plovers, and the occasional rarity, hunted by Peregrine and Merlin. Songbird migrants — warblers, vireos, and flycatchers — move quietly through the leafy lowlands.
On the Salish Sea, the seabird colonies have emptied as young auklets and puffins head to sea, and Heermann's Gulls and Brown Pelicans push north from California to feed in the strait. In the high country of Mount Rainier and the Cascades, Clark's Nutcrackers, Gray Jays, Mountain Bluebirds, and Sooty Grouse work the meadows while the marmots whistle. East of the Cascades, family groups of quail, Lark Sparrows, and bluebirds roam the drying shrub-steppe.
What's Blooming
August holds the subalpine wildflower peak in the highest meadows even as the lower ones go to seed. At Mount Rainier (Paradise and Sunrise) and the Olympics (Hurricane Ridge), the late-summer bloom blazes — broadleaf lupine, magenta and scarlet paintbrush, subalpine spirea, aster, arnica, bistort, pasqueflower seed heads (the shaggy "mouse-on-a-stick"), and monkeyflower along the snowmelt rills.
In the lowlands, fireweed blooms top-out and go to fluff, marking late summer, while pearly everlasting, goldenrod, Douglas aster, and tansy color the roadsides and fields. East of the Cascades the shrub-steppe is golden and dry, but rabbitbrush begins to bud toward its bright yellow fall bloom, and buckwheat and gumweed hold on. The native huckleberries of the Cascades ripen now, a famous late-summer harvest.
Garden This Month
August is peak harvest in the westside garden — tomatoes, beans, summer squash, cucumbers, peppers, corn, blueberries, and blackberries all pour in. With the dry Northwest summer at its driest, steady irrigation and mulch remain critical. Pick beans and zucchini often to keep them producing, and harvest and cure onions and garlic as their tops fall. Watch for late blight on tomatoes if cool, damp nights set in.
This is the last call for fall sowing: get in fall lettuce, spinach, arugula, radishes, and quick greens early in the month while warmth still triggers germination, and set out fall brassica starts. Order garlic for October planting. East of the Cascades, the Columbia Basin garden is in its hottest, most productive stretch — harvest heavily, irrigate deeply, and begin a fall planting where the season allows.
Zone 6b (eastern valleys & foothills): the Columbia Basin garden is in heavy harvest under hot sun. Water consistently, watch for the first cool nights at higher elevation, and sow a fall crop of spinach, lettuce, and radishes.
Zone 7b (Puget lowland & coastal valleys): peak harvest of tomatoes, beans, squash, and corn. Keep watering through the dry spell, and make the last sowings of fall lettuce, spinach, and quick greens for autumn while there is still warmth to germinate them.
Zone 8a (Puget Sound shore & San Juan Islands): the warmest gardens hit full tomato and pepper harvest. Sow overwintering spinach and corn salad, keep up irrigation, and start garlic planning for fall in these long-season coastal soils.
What's at the Farmers Market
August markets brim with the full Washington summer. The first apples (early varieties like Gala and Ginger Gold) arrive from the Columbia Basin orchards, alongside ripe peaches, nectarines, apricots, and plums from Yakima and Wenatchee, late blueberries and blackberries, and the first table grapes and melons from the hot eastern valleys. Vegetable stalls overflow with tomatoes, sweet corn, peppers, eggplant, summer squash, green beans, cucumbers, and Walla Walla sweet onions.
This is also hop harvest in the Yakima Valley, the nation's hop capital — fresh green cones appear briefly at farm stands and for wet-hop brewing. From the water come salmon and albacore tuna. Choose firm, fragrant stone fruit that yields slightly to gentle pressure and ripen it on the counter; pick heavy, glossy tomatoes and keep them at room temperature, never the fridge, for the best flavor.
Night Sky This Month
August is one of Washington's premier stargazing months — warm, dry nights, returning true darkness, and the Milky Way at its highest. The dark-sky destinations shine: Goldendale Observatory State Park above the Columbia Gorge, Washington's flagship public observatory, plus Sun Lakes–Dry Falls, the Methow Valley, and the high Columbia Basin and dark eastern shrub-steppe of the Channeled Scablands and Palouse, where late-summer star parties draw observers. Even the dry westside delivers clear nights now over the Olympics and Cascades.
The Perseid meteor shower, the year's most beloved, peaks around August 12 — bundle up and watch the dark northeast after midnight from a site away from town. The Summer Triangle rides overhead, Scorpius and Sagittarius mark the galactic core in the south, and the Milky Way blazes from horizon to horizon. For this year's exact Perseid timing and planet positions, see the printable Washington night-sky guide.
Butterflies & Pollinators
August keeps Washington's butterflies abundant. In the lowlands, the tiny orange Woodland Skipper erupts in huge numbers — the signature late-summer butterfly of westside gardens and fields — joined by late Western Tiger Swallowtails, Lorquin's Admirals, painted and West Coast Ladies, Pine Whites drifting from the conifers, and Mylitta Crescents.
The high meadows of Mount Rainier and the Cascades still hold their alpine flight — parnassians, meadow fritillaries, blues, and arctics over the late lupine and aster. East of the Cascades, the shrub-steppe and the budding rabbitbrush draw coppers, blues, hairstreaks, and the scarce monarch in the Columbia Basin, where the late-summer generation will soon begin its long, thin migration south. Nectar at goldenrod, aster, and rabbitbrush is the key to finding them now.
What to plant for them is in the Washington native plants guide
Trees This Month
August finds Washington's forests in their dry-season summer green, with the first hints of fall to come. Bigleaf maple and vine maple hold deep green in the lowlands, the native Pacific madrone sheds its outer bark in curling cinnamon-red strips to reveal smooth green beneath — a striking August sight on Puget Sound bluffs — and the berry shrubs finish fruiting. The cascara ripens its dark berries beloved by band-tailed pigeons.
The conifers stand firm: Douglas-fir, western redcedar, western hemlock, grand fir, and coastal Sitka spruce, with their cones now ripening. East of the Cascades, the ponderosa pine and western larch rise over sun-cured gold grass, the orange bark warm and vanilla-scented in the heat, while the riverside black cottonwood and highland quaking aspen begin to show the first tinge of yellow in the dry late-summer air.
The Washington native plants guide covers what grows with them
Weather & Daylight
Across Washington, a typical August day averages a high near 79°F and a low near 52°F, with about 0.9 inches of precipitation — statewide averages from the 1991–2020 U.S. climate normals.
Just as hot as July, high-70s afternoons and warm nights near 52F, with dry ground and only rare showers.
| Average high | 79°F |
|---|---|
| Average low | 52°F |
| Precipitation | 0.9 in |
| Sunrise (mid-month) | 6:01 PT |
| Sunset (mid-month) | 20:18 PT |
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 (PT).
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Same month elsewhere: August in West Virginia · August in Wisconsin · August in Wyoming