September weather forecast and climate
Basel, Switzerland

The Rhine River passing through the city of Basel in Switzerland, with a view of the red stone Munster Cathedral building
The Rhine River passing through the city of Basel in Switzerland, with a view of the red stone Munster Cathedral building

Weather in September

September, the first month of the autumn, in Basel, is also an agreeable month, with temperature in the range of an average low of 10.9°C (51.6°F) and an average high of 20.3°C (68.5°F).

Temperature

In September, the average high-temperature slightly decreases, from a warm 24.7°C (76.5°F) in August, to an agreeable 20.3°C (68.5°F). In Basel, Switzerland,, the average low-temperature is 10.9°C (51.6°F).

Humidity

The average relative humidity in September is 77%.

Rainfall

In September, the rain falls for 8.8 days. Throughout September, 78mm (3.07") of precipitation is accumulated. In Basel, during the entire year, the rain falls for 120.4 days and collects up to 843mm (33.19") of precipitation.

Snowfall

In Basel snow does not fall in May through September.

Daylight

The average length of the day in Basel is 12.6h.

Sunshine

In Basel, Switzerland, the average sunshine is 5.3h.

UV index

In September, the average daily maximum UV index in Basel is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in September in Basel?

In September, the average relative humidity in Basel is 77%.

How many days does it rain in September in Basel?

In Basel, Switzerland, during September, the rain falls for 8.8 days and regularly aggregates up to 78mm (3.07") of precipitation.

When it does not snow in Basel?

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

Does it snow in Basel in September?

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

How many hours of daylight does Basel have in September?

In Basel, Switzerland, the average length of the day in September is 12.6h.

How long on average sun shines in September in Basel?

In September, the average sunshine in Basel, Switzerland, is 5.3h.

How high is the UV index in September in Basel?

The average daily maximum UV index in September in Basel is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Basel, Switzerland

Average temperature in September - Basel, Switzerland
  • Average high temperature in September: 20.3°C

The warmest month (with the highest average high temperature) is July (25.3°C).
The month with the lowest average high temperature is January (4.5°C).

  • Average low temperature in September: 10.9°C

The month with the highest average low temperature is July (14.5°C).
The coldest month (with the lowest average low temperature) is January (-1.1°C).

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Average humidity in September
Basel, Switzerland

Average humidity in September - Basel, Switzerland
  • Average humidity in September: 77%

Months with the highest relative humidity are November and December (82%).
The month with the lowest relative humidity is April (68%).

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Average rainfall in September
Basel, Switzerland

Average rainfall in September - Basel, Switzerland
  • Average rainfall in September: 78mm

The wettest month (with the highest rainfall) is May (99mm).
The driest month (with the least rainfall) is February (45mm).

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Average rainfall days in September
Basel, Switzerland

Average rainfall days in September - Basel, Switzerland
  • Average rainfall days in September: 8.8 days

The month with the highest number of rainy days is May (12.4 days).
The month with the least rainy days is February (8.4 days).

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Average snowfall in September
Basel, Switzerland

Average snowfall in September - Basel, Switzerland
  • Average snowfall in September: 0mm

The month with the highest snowfall is February (115mm).
Months with the least snowfall are May, June, July, August and September (0mm).

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Average snowfall days in September
Basel, Switzerland

Average snowfall days in September - Basel, Switzerland
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (3 days).
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
Basel, Switzerland

Average daylight in September / Average sunshine in September - Basel, Switzerland
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 15.9h).
The month with the shortest days is December (Average daylight: 8.5h).

  • Average sunshine in September: 5.3h

The month with the most sunshine is July (Average sunshine: 7.2h).
The month with the least sunshine is December (Average sunshine: 1.7h).

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Average UV index in September
Basel, Switzerland

Average UV index in September - Basel, Switzerland
  • Average UV index in September: 5

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).

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