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Bern in September: Weather, Average temperature and Climate

Take a look at past year’s weather for Bern in September and see if it is worth visiting.
Check flight prices to Bern on Avionero:
September

Weather in Bern in September 2025

OK Weather
Mild
🌧️
Rainy
Bern in September usually sees fair weather conditions, with an average daily high temperature of +20°C and roughly 6 sunny days. However, you should prepare for about 16 rainy days with an average precipitation of 116 mm. The weather is changeable so pack for every eventuality. Search flights in one click on Avionero.

Average weather

☀️
+20°C
Avg. max. temperature
+1°C
Min.
+32°C
Max.
116 mm
Total precipitation
79%
Avg. humidity
1 m/s
Avg. wind
6 ☀️
Sunny Days
8 ⛅️
Cloudy
16 🌦
Rainy
Our opinion: Bern has OK weather in September.

Average temperature in Bern in September

Here are the expected maximum, average and minimum temperatures in Bern for September based on the historical data.
Last Year
Historical Data

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

Bern weather looks like this, on average, in September and the surrounding months.
AugustSeptemberOctober
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 mm116 mm107 mm
Wind
1 m/s1 m/s1 m/s
Humidity
75%79%83%
Air pressure
1017 HPa1017 HPa1017 HPa
Sunny days
664
Cloudy days
5811
Rainy days
171616
Snowy days
000

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

Wind speed in Bern in September based on historical data.
Last Year
Historical Data

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

Amount of rainfall in mm during September in Bern based on historical data.
Last Year
Historical Data
A chance of rain on a typical day in September stands at 30%, leading to total precipitation of around 63 mm. The maximum amount of rainfall per day is around 25 mm, which is moderate rain. On average, there are about 9 rainy days during September, so prepare to bring an umbrella.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Bern wettest month is July, where a typical day has a 55% chance of precipitation and 164 mm of rainfall per day. February, on the other hand, is the driest month with a mere 24% chance of precipitation and 65 mm of rainfall per day.

How was the weather last September in Bern?

This is the weather in Bern in September 2023:
1 September
☀️
+26°C
2 September
☀️
+27°C
3 September
☀️
+27°C
4 September
☀️
+28°C
5 September
☀️
+29°C
6 September
☀️
+28°C
7 September
☀️
+29°C
8 September
☀️
+30°C
9 September
☀️
+30°C
10 September
☀️
+30°C
11 September
☀️
+30°C
12 September
☀️
+28°C
13 September
🌧️
+21°C
14 September
☁️
+21°C
15 September
☁️
+24°C
16 September
☀️
+24°C
17 September
☀️
+27°C
18 September
🌧️
+18°C
19 September
🌧️
+22°C
20 September
☀️
+24°C
21 September
☁️
+22°C
22 September
🌧️
+19°C
23 September
☁️
+16°C
24 September
☀️
+18°C
25 September
☀️
+21°C
26 September
☀️
+22°C
27 September
☀️
+23°C
28 September
☀️
+25°C
29 September
☀️
+25°C
30 September
☁️
+22°C
In September 2023 Bern had 21 sunny days, 5 cloudy days, and 4 rainy days. The average maximum temperature was +24°C, with an absolute maximum of +30°C and a minimum of +16°C. The average humidity was 75%, with a maximum of 100% and a minimum of 38%. The average wind speed was 1 m/s, with a maximum of 9 m/s and a minimum of 0 m/s.
Are you planning a trip in September?

Climate Change over Years

This is how Bern climate have been changing during last 43 years period.

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

Frequently asked questions about the weather in Bern in September:

Is September a good time to visit Bern?

It’s always a good time to visit Bern, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.

Can you sunbathe in Bern in September?

September has mild temperatures in Bern. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!

Is Bern rainy in September?

Bern is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.

Is it sunny in Bern in September?

Usually, it’s not very sunny in Bern in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.

Other cities in Switzerland

Check out the weather for 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.