Weather in Bern in September 2025
Average weather
Average temperature in Bern in September
The temperature in September is +24°C on average, with a range between a maximum of +30°C during the day and a minimum of +6°C at night.
The average maximum temperature goes down 17% by the end of the month, compared with the beginning of the month, from +26°C to +22°C.
Is Bern warm or cold in September?
Bern is typically mild in September.
Maximum temperatures go down compared to the previous month from +24°C to +20°C. The minimum temperature also goes down from +13°C to +10°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Bern:
Climate in Bern in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +24°C | +20°C | +15°C | ||||
| Min. temperature | ||||||
| +5°C | +1°C | -5°C | ||||
| Max. temperature | ||||||
| +35°C | +32°C | +27°C | ||||
| Rainfall | ||||||
| 152 mm | 116 mm | 107 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 1 m/s | ||||
| Humidity | ||||||
| 75% | 79% | 83% | ||||
| Air pressure | ||||||
| 1017 HPa | 1017 HPa | 1017 HPa | ||||
| Sunny days | ||||||
| 6 | 6 | 4 | ||||
| Cloudy days | ||||||
| 5 | 8 | 11 | ||||
| Rainy days | ||||||
| 17 | 16 | 16 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +24°C in the day, the average maximum temperature lowers to +20°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 152 mm to 116 mm. Humidity rises from 75% to 79%. The average wind speed doesn’t change much during September, staying around 1 m/s. The amount of sunny days stay about the same, averaging 6 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 1 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Bern is gradually decreasing during September, going from 2 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Bern?
Climate Change over Years
The climate in Bern in September has not changed much over the last 43 years.
The average temperature was the lowest in 1980 (+12°C) and the highest in 2022 (+17°C). The driest year was 2003 with only 973 mm of rainfall, and the wettest year was 2002 with 1659 mm.
FAQ
Is September a good time to visit Bern?
Can you sunbathe in Bern in September?
Is Bern rainy in September?
Is it sunny in Bern in September?
Other cities in Switzerland
Monthly weather in Bern
Source of the data
For this page, we’ve looked at the typical weather in Bern, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.