Bern Weather in September
Bern in September sees pleasant daytime temperatures of 20°C (68°F) and nighttime lows of 10°C (50°F). Rainfall is fairly high this month at around 106 mm (4.2 in), so pack a rain jacket to stay dry.
Rainfall in Bern in September
You can typically expect 13 days of rain this month, averaging around 106 mm (4.2 in). When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Bern in September
Daytime highs in Bern in September reach 20°C (68°F), with nights around 10°C (50°F). Conditions are often most pleasant around the middle of the day. Nights drop to 10°C (50°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Bern in September
The area enjoys a moderate level of sunlight, with around 176 hours. It's a good balance between sunny and cloudy days.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Bern.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Switzerland, check out our Bern's climate page.
Bern Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
20°C (68°F)
Chance of Rain
43%
Precipitation
106 mm (4.2 in)
Rainy days
13 days
Humidity
79%
Sunshine
176 hours
Percentage Sunshine
49%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Bern typically drop from around 21°C (70°F) at the start of September to approximately 17°C (63°F) by the end. Nights are cool, with lows typically ranging from 8°C (46°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Bern in September
Browse day-by-day weather records for Bern spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Bern historical weather extremes in September
Based on weather observations in Bern between 1976 and 2025, these are the recorded extremes during September.
- On September 17, 1987, temperatures climbed to 32°C (90°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 6°C (43°F), recorded on September 25, 2002.
- Nighttime temperatures dropped to 1°C (34°F) on September 30, 1989, marking the coldest September night on record.
- Peak precipitation in September occurred on September 18, 2006, when 52 mm (2 in) of precipitation was measured.
Best Places in Switzerland in September
Find out more about the weather in Switzerland and which places have the best travel conditions in this month. See all of Switzerland in September →
perfect weather
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unpleasant
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What to Wear in Bern in September
For Bern in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Bern in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Switzerland, check out our Bern's climate page.
Temperature Rainfall Sunshine Humidity
See the full Bern climate overview or explore weather in Switzerland.
