SeasonMapBern weather in September
Switzerland
September in Bern: nice, a little rain, with clean air — an excellent time to visit.
#4 of 12 months in Bern · #510 of 1383 destinations to visit in September · comfort 84/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Bern in September
Notes from nearby Interlaken (43 km away)
Bern doesn't have its own notes for September yet — these are about Interlaken, close enough to share the season.
Interlaken's forum calls September usually great — slightly cooler than August, upper hiking trails still open, crowds thinner. Regulars are candid it's also genuinely unpredictable — 'roasting hot some years, standing in fresh snow at the Niederhorn others' — with the safest bet being to pack both t-shirts and warm layers, and expect a real chance of much colder conditions at altitude spots like the Jungfraujoch.
Other months in Bern
Switzerland's forum calls July and August the warmest, sunniest months for the lower cities, with some years staying dry and sunny throughout and others bringing rain most days — it varies a lot year to year. Regulars' standard packing list: a t-shirt, a fleece layer, and a proper rain coat, since mountain-influenced weather can change quickly even down in Bern.
Add your own note from Bern's card on the map.
Bern climate normals — September
| Daytime high | 21°C / 69°F | 😎 nice |
|---|---|---|
| Nighttime low | 10°C / 50°F | |
| Feels like (high) | 21°C / 70°F | |
| Rainfall | 80 mm / 3.1 in | 🌦 some rain |
| Rainy days | 11 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 11°C / 52°F | |
| Sunshine | 9 h/day | |
| Daylight | 12.5 h | |
| Wind | 10 km/h / 6 mph | |
| Air quality (US AQI) | 38 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Bern in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Shoulder seasonschool holidays in 3 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Bern's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherBern's weather peaks June–August.
Best weatherFair weatherToughest weather
What's on in Bern in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Aare swimming season
20 May – 15 Sep · usuallySummer season opensThe city swims in the river, not a pool: in at Eichholz, out at the Marzili, and the current does the work. The Aare stays glacier-cold well into June and the exit steps are the whole skill.
Nearby, and something's on
Within 300 km of Bern — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Bern?
Bern in September — FAQ
- Is September a good time to visit Bern?
- September in Bern: nice, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Bern on SeasonMap's comfort score (84/100).
- What is the weather like in Bern in September?
- In September, Bern averages a daily high of 20.5°C and a low of 10.1°C, with about 79.9 mm of rain over roughly 11.3 rainy days.
- What is the air quality in Bern in September?
- Bern has a mean US Air Quality Index of about 38 in September.
Other months in Bern
Warmer or cooler than Bern in September
Similar destinations in Central Europe — September
Within 300 km: Interlaken's Lake steamers on summer timetable on 9 May – 11 Oct, and Gstaad's Walking season and alpine dairies around 15 Jun – 10 Oct.