Munich in September: 19°C / 66°F afternoons, 8.5°C / 47°F nights, 11 rain days — a 10.5°C swing, with the Alps an hour south.
Munich in September is an Alpine city having an early autumn. Deutscher Wetterdienst normals put the afternoon at 19°C / 66°F and the night at 8.5°C / 47°F, with 80mm of rain across 11 days and 5.5 hours of sun. That 10.5-degree swing is wider than the latitude suggests, because the city sits on a plateau at roughly 520 metres with the Alps an hour to the south, and clear nights drain heat fast. The same layer that is redundant at two in the afternoon in the Englischer Garten is the thing standing between you and a miserable evening at a beer-garden table. Munich also dresses more formally than Berlin and more traditionally than Hamburg: dark trousers, a real knit, a proper coat, leather shoes.
Munich sits at 520 metres with the Alps an hour south. The afternoon belongs to the city and the evening belongs to the mountains.

The month's workhorse. Waxed cotton sheds the 80mm of September rain without the clammy feel of a plastic shell, and thigh length covers you at an outdoor table once the temperature drops to 8.5°C / 47°F. Patch pockets carry a phone and a transit ticket when the sleeves are already full. Camel with a dark corduroy collar sits comfortably in a city where a good coat is the baseline.

Munich is an hour from the lakes and people use that. Tegernsee and Starnberger See both sit below 750m, barely a degree cooler than the city, so a wide-rib cotton-blend knit covers the 8.5°C / 47°F evening and the windier shore without becoming the only thing you can wear. It is not enough for the Zugspitze, which is a different kind of trip entirely and needs proper insulation rather than a second sweater. Cream reads cleaner than grey under the barn coat.

Munich dresses up more than most German cities, and a dark trouser is the difference between fitting in at a Schwabing restaurant and looking like you came from the airport. Pleated and relaxed through the thigh for a long walking day; tapered at the ankle so the hem clears wet pavement. Navy over stone, because September rain throws grit up from the cobbles.

The cheapest warmth you can carry and the fastest to take off. The gap between a 19°C / 66°F afternoon and an 8.5°C / 47°F evening is one layer wide, and a chunky knit closes it without committing you to a second coat you then carry all day. Charcoal disappears against everything else in the bag and does not fight Tracht if you end up wearing it.

DWD logs 11 rain days and only 5.5 hours of daily sun, and Munich's autumn rain is steady rather than the short burst you can wait out in a doorway. A full-size umbrella covers you and a companion walking between the Viktualienmarkt and the Residenz; a compact does not. It also survives the wind that comes off the Alps better than a folding frame.
Cream rib knit · navy pleated trousers · flat lug-sole boots · waxed barn coat carried · charcoal scarf. The Alte Pinakothek at opening, Viktualienmarkt at noon, the Englischer Garten before the light goes.
Same knit · barn coat on · flat boots · zip crossbody. A beer-garden table at Augustiner-Keller or a Schwabing restaurant, home at 8.5°C / 47°F.
Per Deutscher Wetterdienst (DWD) normals for 1991–2020: the average daily maximum is 19°C / 66°F, the average minimum is 8.5°C / 47°F, and the monthly mean is 13.7°C / 57°F. Rainfall averages 80mm across about 11 days, with 5.5 hours of sunshine a day. The 10.5°C / 19°F daily swing is the number that matters. Munich sits on a plateau at roughly 520 metres with the Alps an hour south, so clear September nights cool quickly once the sun goes down.
A waxed or wool outer layer, one real knit, dark trousers, flat lug-sole boots, a heavy scarf, a full-size umbrella, and a small zip-top crossbody. Pack for two temperatures rather than one: the afternoon reaches 19°C / 66°F and the evening falls to 8.5°C / 47°F. For a day trip to Tegernsee or Starnberger See, both under 750m, a second knit is enough. The Zugspitze is not that trip: Germany's highest summit stands at 2,962m, roughly 16°C below Munich, so a September day reaching 19°C / 66°F in the city sits near freezing at the top, with wind and often snow. That needs an insulated windproof jacket, gloves and a hat, and the cable car delivers you there without the walking that would otherwise keep you warm.
Easily, and the first two and a half weeks are the best window. Oktoberfest does not begin until September 19 in 2026, so September 1 to 18 is an ordinary, quiet, mild Munich. The Alte Pinakothek, the Pinakothek der Moderne, and the Lenbachhaus with its Blaue Reiter collection are all uncrowded, the Englischer Garten is at its best, and the beer gardens are open regardless — Augustiner-Keller and the Hirschgarten are year-round institutions rather than festival venues. Hotel rates in that first stretch are also far below what they become after the 19th.
The 191st Oktoberfest runs Saturday September 19 to Sunday October 4, 2026 on the Theresienwiese, the open fairground southwest of the old town that locals call the Wiesn. Fourteen large Festzelte go up for the fortnight — timber halls seating several thousand each, with full kitchens, brass bands and long shared benches — alongside about twenty smaller ones and a funfair. Entry is free; you pay for what you eat and drink. A hall is warm and standing-room by mid-evening, so the layer that matters is the one for the walk out at 8.5°C / 47°F, not the one for inside.
Only at Oktoberfest or a similar festival. Tracht is festival and occasion dress, not everyday clothing, and wearing it on a normal Munich weekday reads exactly as oddly as it sounds. If your dates do overlap the Wiesn, locals genuinely wear it and you will not stand out for joining in — what reads badly is a costume-shop version in polyester. Munich's own houses are the reliable route: Lodenfrey has traded on Marienplatz since 1850 and Angermaier since 1948.
September is cooler at both ends and busier in its second half. DWD normals put August near 24°C / 75°F by day and 13°C / 55°F at night against September's 19°C / 66°F and 8.5°C / 47°F, so August is a linen-and-sneakers month while September needs a coat in the evening. August is also the quieter month for hotel rates. September's first eighteen days are mild and calm; from the 19th the Wiesn adds several million visitors and prices climb sharply citywide.
More formally than Berlin and more traditionally than Hamburg. The everyday September register is dark denim or wool trousers, a real knit, a waxed or loden outer layer, and a leather flat or boot. Loden, the boiled wool Munich's Trachten houses built their trade on, turns up in ordinary modern coats all over Schwabing and Glockenbach rather than only in tourist shops. Sportswear worn as daywear stands out, and a good coat carries more weight here than a statement shoe.