2026 Climate Averages

Weather: Interlaken — September

The weather is near-perfect with ideal temperatures and minimal rain. Recommended month to visit.

🌟 Climate Overview

September is an excellent time to visit Interlaken. Warm weather with highs of 21°C—great for outdoor activities. This is one of the wettest months—waterproof gear is essential. As peak season, expect higher prices and more tourists.

5.4
GoTripzi Score Fair

Based on weather comfort, crowds, prices, and activity options

Avg High

21°C

Avg Low

12°C

Rainy days

16days

Daylight

12.6h

Rainfall

185mm

Sunshine

8.8h/day

Humidity

83%

Very Humid
Sun Strength

5.4

High
Wind

8 km/h (gusts 30)

Is September a good time to visit Interlaken?

The weather is near-perfect with ideal temperatures and minimal rain.

Now

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Feels like --
Wind --
Humidity --
UV Index --
Local time —

Air Quality

Travel Context

  • Crowds
    Very Busy
  • Travel Costs Shoulder Rates

Daylight

Sunrise

07:07

Sunset

19:43

12.6h daylight

Visiting Interlaken in September: Pros & Cons

Pros

  • Comfortable temperatures for sightseeing
  • One of the best months to visit

Cons

  • Frequent rain may disrupt outdoor activities
  • Peak season — expect crowds and higher prices

Things to Do in September

Events & Festivals

🏆
Jungfrau Marathon
September Sport

Recommended for This Weather

🏛️ Museums & galleries
🍳 Cooking classes & food tours
🎭 Cultural tours & local experiences

Interlaken Weather by Month

Month Avg High Avg Low Rain Sunshine Humidity UV Index Crowds Condition
Jan 6°C -1°C 13d (112mm) 5.7h
80% Very Humid
2.2 Moderate
Wet
Feb 10°C 1°C 11d (90mm) 7.2h
76% Humid
3.5 Moderate
Good
Mar 12°C 3°C 13d (110mm) 8.9h
74% Humid
5.6 High
Wet
Apr 15°C 5°C 13d (118mm) 10.3h
74% Humid
7.6 Very High
Wet
May 18°C 9°C 19d (183mm) 10.2h
79% Humid
7.8 Very High
Wet
Jun 24°C 14°C 19d (209mm) 11.7h
78% Humid
8.5 Very High
Excellent
Jul 25°C 15°C 19d (237mm) 11.8h
77% Humid
8.3 Very High
Excellent
Aug 25°C 15°C 15d (177mm) 10.8h
78% Humid
7.4 Very High
Excellent
Sep Current 21°C 12°C 16d (185mm) 8.8h
83% Very Humid
5.4 High
Excellent
Oct 17°C 9°C 14d (127mm) 7.5h
83% Very Humid
3.8 Moderate
Wet
Nov 10°C 3°C 14d (128mm) 6h
84% Very Humid
2.4 Moderate
Wet
Dec 6°C 1°C 15d (141mm) 4.8h
83% Very Humid
1.7 Low
Wet

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Your Best MonthAprScore: 7.2
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5.86.Nov
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5.88.Aug
5.29.Feb
4.710.Jun
4.711.Jul
4.712.Sep
3.8

Where to Stay

See hotels, apartments & rentals around Interlaken – live prices from Booking.com, Expedia, Vrbo and more

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Interlaken

Alpine adventure capital between two lakes with Jungfrau panoramas and waterfalls. Discover Jungfraujoch Top of Europe train.

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What to Pack for September

Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions. A waterproof jacket and shoes are non-negotiable — showers are frequent.

Moderate Very Busy

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📋Essentials
👕Clothing
👟Footwear
🎒Accessories
🧴Toiletries & Health

Planning a trip to Interlaken?

🔥 Peak season — book early for best rates

Frequently Asked Questions

Is September a good time to visit Interlaken?
September is typically excellent for visiting Interlaken, with average highs of 21°C and around 16 rainy days. Plan your activities accordingly—outdoor sightseeing is best on dry days, while rainy days are perfect for museums and indoor attractions.
Does it get cold at night in Interlaken in September?
Evenings in Interlaken during September are mild at 12°C. A light cardigan or long sleeves for evenings is usually enough. Outdoor dining remains comfortable, making it a great time to enjoy rooftop bars and terrace restaurants.
What should I pack for Interlaken in September?
With highs of 21°C and lows of 12°C in September, we recommend: Warm layer for evenings, Compact umbrella, Waterproof jacket/shell, Water-resistant shoes. Layering is key as temperatures can vary between air-conditioned interiors and outdoors. Comfortable walking shoes are essential for cobblestone streets.
Does it rain a lot in Interlaken in September?
Interlaken typically sees around 16 rainy days in September. Rain is usually in the form of brief showers rather than all-day downpours, so a compact umbrella is sufficient. Mornings tend to be drier, making them ideal for outdoor sightseeing.
How many hours of daylight are there in Interlaken in September?
In September, Interlaken gets approximately 12.6 hours of daylight per day. This affects how much sightseeing you can fit in—longer days mean more time for outdoor activities, while shorter days are perfect for cozy museum visits and early dinners.
Is September peak season in Interlaken?
Yes, September is peak season in Interlaken. Expect higher prices for accommodation and more crowds at popular attractions, but also the best weather conditions. Book hotels and major attractions in advance to secure availability and better rates.

Weather Data: Based on 2020–2025 historical climate data from Open-Meteo

Solar calculations: SunCalc (timezone: Europe/Zurich)

Last Updated: March 2026

More Interlaken Guides

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