September weather - Autumn 2023 - Zürich, Switzerland

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

Ships ashore on Lake Zürich, with a view of the Fraumunster and Grossmunster Churches on either side of the water, in Zürich, Switzerland

Weather in September

September in Zürich ushers in autumn, with cooler temperatures and vibrant foliage colouring the city. While rainfall averages at 99mm, the weather remains overall pleasant, with moderate temperatures and substantially long daylight hours. The weather in this month makes it perfect for leisurely strolls around the city parks, enjoying the colourful change in scenery.

Temperature

With the commencement of September, Zürich records a moderate temperature decline, with the average high easing from August's moderately hot 23.3°C to a refreshing 18.8°C. In September, the average low-temperature records at a cool 10.5°C during the nights.

Humidity

In September, the average relative humidity is 79%.

Rainfall

In Zürich, in September, during 10.2 rainfall days, 99mm of precipitation is typically accumulated. In Zürich, during the entire year, the rain falls for 133.9 days and collects up to 1133mm of precipitation.

Snowfall

May through September are months without snowfall in Zürich, Switzerland.

Daylight

In Zürich, the average length of the day in September is 12h and 34min.
On the first day of the month, sunrise is at 06:44 and sunset at 20:07. On the last day of September, in Zürich, sunrise is at 07:23 and sunset at 19:08 CEST.

Sunshine

In September, the average sunshine is 5h.

UV index

In Zürich, 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 rays for the ordinary person.
Note: The daily high UV index of 5 in September translates into this advice:
Be vigilant - Suggestions to stave off sun damage are provided. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.

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FAQ

What are September temperatures in Zürich?

In Zürich, in September, the average high-temperature is 18.8°C, and the average low-temperature is 10.5°C.

What is the average humidity in September in Zürich?

In Zürich, the average relative humidity in September is 79%.

How many days does it rain in September in Zürich?

In September, the rain falls for 10.2 days. Throughout September, 99mm of precipitation is accumulated.

When it does not snow in Zürich?

May through September are months without snowfall.

Does it snow in Zürich in September?

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

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

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

When is the sunrise / sunset in September in Zürich?

On the first day of September in Zürich, sunrise is at 06:44 and sunset at 20:07. On the last day of the month, sunrise is at 07:23 and sunset at 19:08 CEST.

How many hours of sunshine does Zürich have in September?

In September, the average sunshine duration in Zürich, Switzerland, is 5h.

What is the UV index intensity in September in Zürich?

In September, the average daily maximum UV index in Zürich is 5. A UV Index value 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

23.3°C

18.8°C

13.7°C

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
Zürich, Switzerland

Average high temperature in September: 18.8°C

The warmest month (with the highest average high temperature) is July (24°C).
The month with the lowest average high temperature is January (2.9°C).

Average low temperature in September: 10.5°C

The month with the highest average low temperature is July (14°C).
The coldest month (with the lowest average low temperature) is January (-2°C).

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Average humidity in September
Zürich, Switzerland

Average humidity in September: 79%

The months with the highest relative humidity are November and December (84%).
The month with the lowest relative humidity is April (69%).

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Average rainfall in September
Zürich, Switzerland

Average rainfall in September: 99mm

The wettest month (with the highest rainfall) is June (128mm).
The driest month (with the least rainfall) is January (63mm).

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Average rainfall days in September
Zürich, Switzerland

Average rainfall days in September: 10.2 days

The month with the highest number of rainy days is June (12.7 days).
The month with the least rainy days is February (9.3 days).

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Average snowfall in September
Zürich, Switzerland

Average snowfall in September: 0mm

The month with the highest snowfall is February (220mm).
The months with the least snowfall are May, June, July, August and September (0mm).

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Average snowfall days in September
Zürich, Switzerland

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

Average sunshine in September: 5h and 0min

The month with the most sunshine is July (Average sunshine: 6h and 54min).
The month with the least sunshine is December (Average sunshine: 1h and 24min).

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Average UV index in September
Zürich, 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
Zürich, Switzerland

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