September weather - Autumn 2024

Weather in September
Frequently asked questions
Average temperature in September
Average humidity in September
Average rainfall in September
Average rainfall days in September
Average snowfall in September
Average snowfall days in September
Average daylight in September
Average sunshine in September
Average UV index in September

The leafy landscape, beautiful blue waters, and the city buildings of Bern, Switzerland

Weather in September

September in Bern transits from the summer's warmth to autumn's coolness. While the temperature switches to a noticeable drop compared to August, it does not compromise on the city's weather appeal. With a maximum temperature of 19.1°C (66.4°F) and a minimum of 8.9°C (48°F), the climate remains tolerable. Afternoons are graced with considerable sunshine even though daylight hours start to retreat. The onset of autumn adds to the aesthetic charm with an ensemble of colorful foliage.

Temperature

As August shifts into September in Bern, a minor alteration in temperatures is observed, with average highs reducing from a warm 23.7°C (74.7°F) to a comfortable 19.1°C (66.4°F). Bern, in the month of September, anticipates a consistent average low-temperature of 8.9°C (48°F).

Humidity

The average relative humidity in September in Bern, Switzerland, is 79%.

Rainfall

In Bern, Switzerland, during September, the rain falls for 8.9 days and regularly aggregates up to 99mm (3.9") of precipitation. Throughout the year, there are 124.2 rainfall days, and 1059mm (41.69") of precipitation is accumulated.

Snowfall

In Bern, snow does not fall in May through September.

Daylight

In September, the average length of the day is 12h and 34min.
On the first day of September in Bern, Switzerland, sunrise is at 06:50 and sunset at 20:09. On the last day of the month, sunrise is at 07:28 and sunset at 19:11 CEST.

Sunshine

In September, the average sunshine is 5.5h.

UV index

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the UV index of 5 transforms into the following advice:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.

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Frequently asked questions

What are the temperatures in Bern in September?

The average high-temperature and low-temperature in Bern, Switzerland, during September are 19.1°C (66.4°F) and 8.9°C (48°F) respectively.

What is the average humidity in September in Bern?

The average relative humidity in September in Bern, Switzerland, is 79%.

How many days does it rain in September in Bern?

In Bern, in September, it is raining for 8.9 days, with typically 99mm (3.9") of accumulated precipitation.

When it does not snow in Bern?

In Bern, Switzerland, snow does not fall in May through September.

Does it snow in Bern in September?

In Bern, Switzerland, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Bern?

In Bern, the average day length in September is 12h and 34min.

When are sunrise and sunset in September in Bern?

On the first day of September in Bern, Switzerland, sunrise is at 06:50 and sunset at 20:09. On the last day of the month, sunrise is at 07:28 and sunset at 19:11 CEST.

How long on average sun shines in September in Bern?

In September, the average sunshine duration in Bern is 5.5h.

What is the UV index intensity in September in Bern?

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

23.7°C 74.7°F

19.1°C 66.4°F

13.8°C 56.8°F

Average low temperature

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average UV index

Average temperature in September
Bern, Switzerland

Average high temperature in September: 19.1°C

The warmest month (with the highest average high temperature) is July (24.3°C).
The month with the lowest average high temperature is January (2.8°C).

Average low temperature in September: 8.9°C

The month with the highest average low temperature is July (12.5°C).
The coldest month (with the lowest average low temperature) is January (-3.6°C).

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Average humidity in September
Bern, Switzerland

Average humidity in September: 79%

The months with the highest relative humidity are November and December (85%).
The months with the lowest relative humidity are April, June and July (71%).

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Average rainfall in September
Bern, Switzerland

Average rainfall in September: 99mm

The wettest month (with the highest rainfall) is May (119mm).
The driest month (with the least rainfall) is February (55mm).

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Average rainfall days in September
Bern, Switzerland

Average rainfall days in September: 8.9 days

The month with the highest number of rainy days is May (12.6 days).
The month with the least rainy days is September (8.9 days).

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Average snowfall in September
Bern, Switzerland

Average snowfall in September: 0mm

The month with the highest snowfall is December (133mm).
The months with the least snowfall are May, June, July, August and September (0mm).

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Average snowfall days in September
Bern, Switzerland

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Bern, Switzerland

Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

Average sunshine in September: 5h and 3min

The month with the most sunshine is July (Average sunshine: 7h and 36min).
The month with the least sunshine is December (Average sunshine: 1h and 36min).

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Average UV index in September
Bern, Switzerland

Average UV index in September: 5

The months with the highest UV index are June and July (UV index 8).
The months with the lowest UV index are January, November and December (UV index 1).

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September weather forecast
Bern, Switzerland

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