Vienna in August is late Austrian summer — 27°C / 81°F afternoons, 16°C / 61°F nights, 9 rain days. Salzburg Festival continues through late August.
Vienna in August continues late Austrian summer. ZAMG data put afternoon highs at 27°C / 81°F and overnight lows at 16°C / 61°F with 9 rain days. Daylight shrinks from 15h 30m in early August to 13h 45m by month-end. Salzburg Festival continues through late August (closes the last weekend). Late August evenings drop to 13-15°C / 55-59°F — pack a light wool overcoat or loden coat. The dressing rule continues from July: lightweight cotton, light cardigan, packable rain shell, leather sneakers, sunglasses, sun hat. Loden-Plankl, J. & L. Lobmeyr, Augarten, Wiener Werkstätte heritage continue. Schönbrunn, Belvedere, Hofburg, Albertina, Kunsthistorisches at peak tourist programming. Heuriger districts (Grinzing, Sievering, Stammersdorf) at peak harvest-week — the new wine vintage starts pressing late August.
Vienna August is late summer continuing — Salzburg Festival running through late August, the Café Central terrace at the year's best evening light, the Heuriger districts at peak harvest-week. Habsburg-classical neutrals hold firm.

ZAMG puts Vienna August at 27°C / 81°F afternoons with humidex 30-32°C / 86-90°F under 65% humidity. Cotton breathes through the ImPulsTanz finale (closes mid-August) crowds at MuseumsQuartier; sage, terracotta, or oat hold the late-summer Habsburg-classical palette.

16°C / 61°F nights creep to 13°C / 55°F by month-end as daylight contracts 15h 30m to 13h 45m. Wolford (Bregenz 1950) merino cardigan layers under the cotton dress without bulk; pulls on at Café Demel (1786) and through the Kunsthistorisches AC.

ZAMG logs 9 rain days in August totalling 65mm — the driest local summer month but afternoon thunderstorms still build off the Wienerwald 4-6pm. Pack flat into the crossbody for the Schönbrunn morning; deploy when thunder rolls over Stephansdom.

Vienna's daily uniform from Innere Stadt to Wieden's Karlsplatz. Cos for the under-€100 trouser; Petar Petrov for the Vienna-cut higher register. Late-August cellar visits in the Wachau require trouser-and-button-down minimum at Dürnstein and Krems Heuriger doors.

Innere Stadt cobble runs 2km uneven from Graben to Kärntner Straße; the Heuriger paths in Grinzing add gravel. Common Projects sneakers for daily; R. Horn's (Vienna 1880 leather) low-heel boots for the cooler 13°C / 55°F evening preview of September.

Steirereck (3-Michelin, Stadtpark) and Konstantin Filippou enforce smart-casual; Austrian dining 7-10pm runs through August. White or pale-blue cotton tucks under the wool trouser without overheating in the 16°C / 61°F sunset cool.

Late-August evenings drop to 13-15°C / 55-59°F as the new wine vintage starts pressing in the Wachau. Loden-Plankl's summer-weight version (~400g) handles the cool sunset without overheating in the 27°C / 81°F afternoon — the heritage Vienna outerwear bridge into September.

UV index 6-7 holds through the early-month afternoons; the Wachauer Marillenbrand (apricot brandy) cellar doors open from 11am. Mühlbauer (Vienna 1903) wool scarf in stone or oat handles the Heuriger return walk; crossbody keeps hands free for the cellar tasting flight.
Cotton dress · sneakers · cardigan · rain shell · sun hat · crossbody. Café Central 8am, Schönbrunn 9am, brunch at Tian 11am.
Trousers · button-down · light loden coat · low-heel boots. Dinner at Steirereck 7:30pm; Heuriger evening; cocktails at Loos Bar after.
A suggested look — Vienna August masculine/neutral evening look: pale button-down, charcoal tailored trousers, brown low-heel boots, light olive summer loden coat carried, compact black leather crossbody; no backpack.
Yes — August is late Austrian summer with Salzburg Festival running through late August, longer daylight at 14h 30m. Per ZAMG: 27°C (81°F) afternoons, 16°C (61°F) mornings, 9 rain days — drier than May-July. Hotel rates lower than December Christmas-market peak. Pack the lightweight cotton-and-cardigan combination with a packable rain shell.
Per ZAMG: average daily high 27°C (81°F), low 16°C (61°F), 9 rain days totalling 65mm. Late Austrian summer; the driest local summer month. Daylight shrinks from 15h 30m in early August to 13h 45m by month-end. UV index 6-7 (moderate-to-high). Late August evenings drop to 13-15°C / 55-59°F.
Heuriger (Vienna's traditional wine taverns serving young wine) hits peak in late August through September — the new wine vintage starts pressing late August. The Heuriger districts (Grinzing 1130 Vienna, Sievering, Stammersdorf 21st district, Nussdorf) run nightly programming. Pack: smart-casual, leather sneakers (cobble), cotton-and-cardigan layered, packable rain shell, light loden coat for cool evening. The Wiener Schrammelmusik (Viennese folk music with violin, accordion, guitar) signature is part of the Heuriger experience. Most Heuriger open from 4pm to midnight.
Yes — Wachau Valley (90 minutes northwest of Vienna by ÖBB train, UNESCO Danube wine region) is at peak harvest. Cellar doors at Dürnstein, Krems, Spitz, Weißenkirchen — Riesling and Grüner Veltliner are the regional varietals. Melk Abbey (UNESCO 1089 baroque abbey) anchors the upstream end of the valley. Apricot brandy (Wachauer Marillenbrand) is the regional specialty. Pack: lightweight cotton, leather sneakers (vineyard walking), light cardigan for cellar-door cool, packable rain shell, sun hat. Cellar-door etiquette: smart-casual minimum.
Vienna State Opera (the season starts September; August is between seasons but rare special events run); Salzburg Festival (3 hours by train, late July through late August); Heuriger districts (Grinzing, Sievering, Stammersdorf — the most-cited Vienna evening); Donauinsel and Alte Donau river-island swimming (the heritage urban beach); MuseumsQuartier evening cafes; Schönbrunn evening palace tours (special programming); the heritage coffeehouses (Café Central, Café Sacher, Demel) for late-evening cake-and-coffee. Pack: cotton dress, leather sneakers, light cardigan, packable rain shell, sun hat.