September weather forecast
Heidelberg, Germany

Weather in September

September, the first month of the autumn in Heidelberg, is also an agreeable month, with temperature in the range of an average high of 20.6°C (69.1°F) and an average low of 11.4°C (52.5°F).

Temperature

In Heidelberg, the average high-temperature in September drops from a warm 25.8°C (78.4°F) in August to a pleasant 20.6°C (69.1°F). The average low-temperature, in Heidelberg, is 11.4°C (52.5°F).

Humidity

The average relative humidity in September in Heidelberg is 72%.

Rainfall

In Heidelberg, during September, the rain falls for 10.8 days and regularly aggregates up to 28mm (1.1") of precipitation. In Heidelberg, during the entire year, the rain falls for 164.2 days and collects up to 434mm (17.09") of precipitation.

Snowfall

In Heidelberg, snow does not fall in April through September.

Daylight

The average length of the day in September is 12h and 36min.
On the first day of the month, sunrise is at 06:41 and sunset at 20:09. On the last day of September, sunrise is at 07:23 and sunset at 19:07 CEST.

Sunshine

The average sunshine in September in Heidelberg is 8.7h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Heidelberg?

In Heidelberg, Germany, in September, the average high-temperature is 20.6°C (69.1°F), and the average low-temperature is 11.4°C (52.5°F).

What is the average humidity in September in Heidelberg?

In Heidelberg, Germany, the average relative humidity in September is 72%.

How many days does it rain in September in Heidelberg?

In September, in Heidelberg, Germany, the rain falls for 10.8 days. Throughout September, 28mm (1.1") of precipitation is accumulated.

When it does not snow in Heidelberg?

April through September are months without snowfall.

Does it snow in Heidelberg in September?

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

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

In September, the average day length in Heidelberg, Germany, is 12h and 36min.

When are sunrise and sunset in September in Heidelberg?

In September, on the first day of the month, sunrise is at 06:41 and sunset at 20:09. On the last day of the month, in Heidelberg, sunrise is at 07:23 and sunset at 19:07 CEST.

How many hours of sunshine does Heidelberg have in September?

In September, the average sunshine duration in Heidelberg, Germany, is 8.7h.

What is the UV index intensity in September in Heidelberg?

The average daily maximum UV index in September in Heidelberg is 4. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Heidelberg, Germany

Average temperature in September - Heidelberg, Germany
  • Average high temperature in September: 20.6°C

The warmest month (with the highest average high temperature) is August (25.8°C).
The month with the lowest average high temperature is January (4°C).

  • Average low temperature in September: 11.4°C

The month with the highest average low temperature is August (15.3°C).
The coldest month (with the lowest average low temperature) is January (-0.3°C).

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Average pressure in September
Heidelberg, Germany

Average pressure in September - Heidelberg, Germany
  • Average pressure in September: 1018.3mbar

The month with the highest atmospheric pressure is December (1019.1mbar).
The month with the lowest atmospheric pressure is November (1015mbar).

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Average wind speed in September
Heidelberg, Germany

Average wind speed in September - Heidelberg, Germany
  • Average wind speed in September: 8.8km/h

The windiest month (with the highest average wind speed) is February (12.3km/h).
The calmest month (with the lowest average wind speed) is August (8.7km/h).

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Average humidity in September
Heidelberg, Germany

Average humidity in September - Heidelberg, Germany
  • Average humidity in September: 72%

The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are July and August (67%).

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Average rainfall in September
Heidelberg, Germany

Average rainfall in September - Heidelberg, Germany
  • Average rainfall in September: 28mm

The wettest month (with the highest rainfall) is May (50mm).
The driest month (with the least rainfall) is April (19mm).

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Average rainfall days in September
Heidelberg, Germany

Average rainfall days in September - Heidelberg, Germany
  • Average rainfall days in September: 10.8 days

The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is September (10.8 days).

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Average snowfall in September
Heidelberg, Germany

Average snowfall in September - Heidelberg, Germany
  • Average snowfall in September: 0mm

The month with the highest snowfall is December (44mm).
The months with the least snowfall are April, May, June, July, August and September (0mm).

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Average snowfall days in September
Heidelberg, Germany

Average snowfall days in September - Heidelberg, Germany
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.4 days).
The months with the least snowfall days are April, May, June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Heidelberg, Germany

Average daylight in September / Average sunshine in September - Heidelberg, Germany
  • Average daylight in September: 12h and 36min

The month with the longest days is June (Average daylight: 16h and 11min).
The month with the shortest days is December (Average daylight: 8h and 16min).

  • Average sunshine in September: 8h and 42min

The months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).

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Average sunshine days in September
Heidelberg, Germany

Average sunshine days in September - Heidelberg, Germany
  • Average sunshine days in September: 17.3 days

The month with the most sunshine days is September (17.3 days).
The month with the least sunshine days is December (11.5 days).

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Average UV index in September
Heidelberg, Germany

Average UV index in September - Heidelberg, Germany
  • Average UV index in September: 4

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Heidelberg, Germany

Average cloud cover in September - Heidelberg, Germany
  • Average cloud cover in September: 35

The month with the most cloud cover is December (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 30).

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Average visibility in September
Heidelberg, Germany

Average visibility in September - Heidelberg, Germany
  • Average visibility in September: 9km

The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (9km).
The months with the lowest visibility are January and December (8km).

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