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Interlaken in September: Best Activities & Seasonal Highlights

September’s sunrise at 7:00 AM and temperatures of 14–20°C (57–68°F) bring crisp mornings and golden afternoons. The Jungfrau Marathon and Alpabzug cattle descents are highlights, along with wine harvests in Spiez. Crowds thin after the marathon, and hotel rates drop. Autumn colors begin to appear, and menus feature new cheeses and game. It’s the best month for photography and outdoor adventures, with full access to mountain trains and trails but fewer queues than summer.

Interlaken in September at a glance

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Weather
Maximum temperature: 20°C
Minimum temperature: 14°C
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Daylight
Around 12 hours 30 minutes of daylight
Sunrise: 7am
Sunset: 7:30pm
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Key events
Alpabzug / Alpabfahrt, Chästeilet Justistal, Harder Kulm Funicular Season, St. Beatus Caves Season
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Crowds

Tourist-heavy, with long queues at attractions, crowded streets, and seasonal events adding to the buzz.

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What to pack

Light sweater, hiking boots, rain jacket, camera, sun hat, picnic blanket, layers for cool mornings, wine-tasting outfit.

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Seasonal treats

Alpkäse (alpine cheese), Wildspezialitäten (game dishes), Zwetschgenwähe, Berner Oberländer Wein, fresh apples, new cheeses.

Festivals and events in Interlaken this September 2026

Alpabzug / Alpabfahrt

  • Dates:September 14, 2026 to September 30, 2026
  • Event type:Festival
  • Location:Bernese Oberland

Decorated cattle return through villages like Habkern and Beatenberg with bells and flowers. Timing shifts. Check notices locally.

Chästeilet Justistal

  • Dates:September 25, 2026 to September 30, 2026
  • Event type:Festival
  • Location:Justistal

Cheese-dividing ceremony in Justistal where summer Alpkäse is weighed and shared. Folk music and market stalls. Arrive early.

European Heritage Days (Denkmaltage)

  • Dates:September 12, 2026 to September 13, 2026
  • Event type:Festival
  • Location:Interlaken

Free tours open normally closed historic sites across Interlaken and the region. Limited slots. Choose targets and arrive early.

Spiez Winegrape Harvest Open Cellar

  • Dates:September 1, 2026 to October 31, 2026
  • Event type:Festival
  • Location:Schloss Spiez

Harvest-season open-cellar tastings at Schloss Spiez winery on Lake Thun. Easy train trip. Book tastings if required.

Harder Kulm Funicular Season

  • Dates:April 1, 2026 to November 30, 2026
  • Event type:Nature & outdoor
  • Location:Interlaken

Harder Kulm viewpoint season runs roughly April to November, giving classic lake-and-peak panoramas. Go late afternoon. Check operating dates.

St. Beatus Caves Season

  • Dates:April 1, 2026 to November 30, 2026
  • Event type:Nature & outdoor
  • Location:Interlaken

St. Beatus Caves typically open April to November for stalactite cave visits. Good rainy-day swap. Confirm hours before travelling.

Trümmelbach Falls Season

  • Dates:April 1, 2026 to November 30, 2026
  • Event type:Nature & outdoor
  • Location:Interlaken

Trümmelbach Falls in Lauterbrunnen valley runs April to November. Snowmelt boosts volume in spring. Start early to dodge tour groups.

Lake Thun & Brienz Boat Season

  • Dates:May 1, 2026 to October 31, 2026
  • Event type:Nature & outdoor
  • Location:Interlaken

Boat cruises on Lake Thun and Lake Brienz generally run May to October, including paddle steamers. Choose calm mornings. Timetables vary.

Grindelwald-First Summer Season

  • Dates:May 1, 2026 to October 31, 2026
  • Event type:Nature & outdoor
  • Location:Grindelwald

Grindelwald-First operates mainly May to October for Cliff Walk, First Flyer, and Mountain Carts. Start early. Check dates before booking.

Aareschlucht Gorge Walkway Season

  • Dates:April 1, 2026 to October 31, 2026
  • Event type:Nature & outdoor
  • Location:Interlaken

Aareschlucht, a 1.4 km gorge walkway near Meiringen, opens in April. Good shoulder-season plan. Bring a light jacket inside the gorge.

Schynige Platte Alpine Garden Season

  • Dates:June 1, 2026 to October 31, 2026
  • Event type:Flower & garden
  • Location:Interlaken

Schynige Platte Alpine Garden opens in summer, showcasing 700+ alpine plant species. Go on clear days. Check seasonal dates before you go.

Canyoning and Rafting Peak Season

  • Dates:July 1, 2026 to September 30, 2026
  • Event type:Nature & outdoor
  • Location:Interlaken

Summer is prime time for Interlaken’s canyoning and rafting scene. Operators run group trips. Book 2–3 days ahead in July and August.

What to eat in Interlaken in September: Seasonal delicacies

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Alpkäse [alpine hard cheese]

After September cattle descents, buy Alpkäse at markets or farm-gate, snack at sunset, pair with bread.
Where to get: Interlaken

Wildspezialitäten [game meat dishes]

September starts game season, order venison ragout with Spätzli and red cabbage, reserve tables, eat dinner.
Where to get: Restaurant Alpenblick

Berner Oberländer Wein [Lake Thun wine]

September harvest season suits Lake Thun wines from Spiez, taste at cellar, pair with cheese, book tastings.
Where to get: Schloss Spiez

Cholera [savoury vegetable pie]

Rustic pie of potatoes, leeks, apples, cheese and bacon suits September hikes, eat warm, pair with salad.
Where to get: Interlaken

Zwetschgenwähe [plum tart]

September keeps plum tarts in season, buy fresh early, eat with coffee, take slices for train rides.
Where to get: Interlaken

Pro tips for visiting Interlaken in September

• Book accommodation 3+ months ahead for Jungfrau Marathon weekend—rooms fill quickly and prices spike.
• Go early to Alpabzug cattle descents in Habkern or Beatenberg—processions start mid-morning and parking is limited.
• Reserve spots for Spiez wine harvest tastings—cellars open on select weekends in September and October.
• Head to mountain trails for autumn colors—photography is best in the golden afternoon light.
• Avoid high-altitude hikes after mid-September—some lifts and huts begin to close for the season.
• Choose Ballenberg Open-Air Museum for harvest-themed events—weekdays are quieter.
• Pack for chilly mornings and warm afternoons—layers are essential.
• Visit Interlaken Herbstmarkt in mid-October for cheese, honey, and crafts if staying into the next month.