Early autumn · Weather & things to do
Interlaken in September
Interlaken cools off: highs slip to 69°F (21°C), from 76°F in August, with lows of 53°F (12°C) and about 4.2 in (106 mm) of rain.
September opens the best stretch on our comfort score, at 82/100 (the top score of the year).
- Avg high
- 69°F (21°C)
- Avg low
- 53°F (12°C)
- Rain
- 4.2 in (106 mm)
- Humidity
- 81%
- Cloud cover
- 60%
- Daylight
- ~12 h 19 min
- Comfort score
- 82/100 · Great
What September feels like
Highs near 69°F (21°C) make for comfortable sightseeing weather.
Nights cool to an average low of 53°F (12°C).
Some rain is likely, about 4.2 in (106 mm) in the month, so pack for a shower or two.
Plan around September
September is one of Interlaken's best months on the climate data.
- Opens the best-scoring stretch on our comfort score: September.
- Comfort improves from 68/100 in August to 82/100.
- September sits inside the May – Oct window our Swiss Lakes by Rail route recommends.
What to pack for September
- A warm layer for eveningslows near 53°F
- Packable rain jacket or umbrellaa shower or two is likely
- Comfortable walking shoesmost picks involve some walking
What to do in Interlaken in September
September is good outdoor weather here, so these picks lean toward the open air.
Schynige Platte
Historic cog railway to an alpine garden and ridge walks.
Why now Our curated notes say it's best Jun–Oct.
Trümmelbach Falls
Glacial falls thundering inside the mountain, reached by a tunnel lift.
Why now Our curated notes say it's best Apr–Nov.
Giessbach Falls
Waterfalls dropping in 14 tiers, reached by boat and historic funicular.
Why now Our curated notes say it's best May–Oct.
Harder Kulm
Funicular to a viewpoint over Lake Thun and Lake Brienz, with Eiger, Mönch and Jungfrau views.
Why now September scores 82/100 for comfort, good conditions for being outside.
Harder Kulm Panorama Restaurant
Restaurant at the top of the Harder Kulm funicular with lake and Jungfrau views.
Why now Highs near 69°F and 4.2 in of monthly rain make this an easy outdoor pick.
Nearby in September
- Lucerne in September~33 mi · highs 68°F, 4.0 in rain · similar daytime temperatures, about as wet
- Andermatt in September~34 mi · highs 54°F, 4.7 in rain · 8°C (15°F) cooler by day, about as wet
- Zermatt in September~47 mi · highs 58°F, 2.7 in rain · 6°C (11°F) cooler by day, drier
- Zurich in September~57 mi · highs 67°F, 4.1 in rain · 1°C (2°F) cooler by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~1,854 m to Interlaken's ~569 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Interlaken in September: quick answers
Is September a good time to visit Interlaken?
Yes. On the climate data it's one of the best months, scoring 82/100. Expect highs of 69°F (21°C) and 4.2 in (106 mm) of rain. September is inside the May – Oct window our Swiss Lakes by Rail route recommends.
How hot is Interlaken in September?
Average highs are 69°F (21°C) and average lows 53°F (12°C), making it the 4th-warmest month by daytime highs.
Does it rain a lot in Interlaken in September?
Some: about 4.2 in (106 mm) of rain falls across September on average, the 6th-driest month of the year. The annual total is about 54.3 in (1379 mm).
What should I pack for Interlaken in September?
Bring a warm layer for evenings (lows near 53°F), packable rain jacket or umbrella (a shower or two is likely) and comfortable walking shoes (most picks involve some walking).
More on Interlaken
Routes in season in September
- Swiss Lakes by Rail May – Oct
Planning Interlaken in September?
Share this September plan with your group, poll everyone on dates and keep the packing list in one place.