September weather forecast and climate
Hoeilaart, Belgium

Weather in September

September, the first month of the autumn, in Hoeilaart, is still a comfortable month, with average temperature varying between 19.6°C (67.3°F) and 11.3°C (52.3°F).

Temperature

In September, the average high-temperature marginally drops, from a warm 23.1°C (73.6°F) in August, to a comfortable 19.6°C (67.3°F). In Hoeilaart, the average low-temperature is 11.3°C (52.3°F).

Humidity

In Hoeilaart, the average relative humidity in September is 78%.

Rainfall

In Hoeilaart, it is raining for 12.5 days, with typically 31mm (1.22") of accumulated precipitation. Throughout the year, there are 179.3 rainfall days, and 469mm (18.46") of precipitation is accumulated.

Snowfall

In Hoeilaart, Belgium, snow does not fall in April through September.

Daylight

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

Sunshine

In September, the average sunshine is 7.5h.

UV index

In September, the average daily maximum UV index in Hoeilaart is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 4 transform into the following instructions:
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. 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 temperature in September in Hoeilaart?

In Hoeilaart, Belgium, in September, the average high-temperature is 19.6°C (67.3°F), and the average low-temperature is 11.3°C (52.3°F).

What is the average humidity in September in Hoeilaart?

The average relative humidity in September in Hoeilaart is 78%.

How much does it rain in Hoeilaart in September?

In Hoeilaart, Belgium, in September, during 12.5 rainfall days, 31mm (1.22") of precipitation is typically accumulated.

Does it snow in Hoeilaart in September?

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

When it does not snow in Hoeilaart?

In Hoeilaart, Belgium, snow does not fall in April through September.

How many hours of daylight does Hoeilaart have in September?

The average length of the day in September in Hoeilaart is 12.6h.

How many hours of sunshine does Hoeilaart have in September?

In September, the average sunshine in Hoeilaart, Belgium, is 7.5h.

What is the UV index reading in September in Hoeilaart?

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.

Average temperature in September
Hoeilaart, Belgium

Average temperature in September - Hoeilaart, Belgium
  • Average high temperature in September: 19.6°C

The warmest month (with the highest average high temperature) is August (23.1°C).
The month with the lowest average high temperature is January (5°C).

  • Average low temperature in September: 11.3°C

The month with the highest average low temperature is August (13.8°C).
The coldest month (with the lowest average low temperature) is January (1°C).

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Average pressure in September
Hoeilaart, Belgium

Average pressure in September - Hoeilaart, Belgium
  • Average pressure in September: 1017.4mbar

The month with the highest atmospheric pressure is September (1017.4mbar).
The month with the lowest atmospheric pressure is November (1012.5mbar).

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Average wind speed in September
Hoeilaart, Belgium

Average wind speed in September - Hoeilaart, Belgium
  • Average wind speed in September: 12.1km/h

The windiest month (with the highest average wind speed) is December (18.1km/h).
The calmest month (with the lowest average wind speed) is August (11.7km/h).

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Average humidity in September
Hoeilaart, Belgium

Average humidity in September - Hoeilaart, Belgium
  • Average humidity in September: 78%

The month with the highest relative humidity is December (88%).
Months with the lowest relative humidity are April, July and August (75%).

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Average rainfall in September
Hoeilaart, Belgium

Average rainfall in September - Hoeilaart, Belgium
  • Average rainfall in September: 31mm

The wettest month (with the highest rainfall) is December (54mm).
The driest month (with the least rainfall) is April (25mm).

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Average rainfall days in September
Hoeilaart, Belgium

Average rainfall days in September - Hoeilaart, Belgium
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is February (11.6 days).

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Average snowfall in September
Hoeilaart, Belgium

Average snowfall in September - Hoeilaart, Belgium
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (34mm).
Months with the least snowfall are April, May, June, July, August and September (0mm).

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Average snowfall days in September
Hoeilaart, Belgium

Average snowfall days in September - Hoeilaart, Belgium
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4.3 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
Hoeilaart, Belgium

Average daylight in September / Average sunshine in September - Hoeilaart, Belgium
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16.4h).
The month with the shortest days is December (Average daylight: 8.1h).

  • Average sunshine in September: 7.5h

Months with the most sunshine are July and August (Average sunshine: 9h).
The month with the least sunshine is December (Average sunshine: 3.6h).

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Average sunshine days in September
Hoeilaart, Belgium

Average sunshine days in September - Hoeilaart, Belgium
  • Average sunshine days in September: 14.6 days

The month with the most sunshine days is September (14.6 days).
Months with the least sunshine days are February, August and December (10.9 days).

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Average UV index in September
Hoeilaart, Belgium

Average UV index in September - Hoeilaart, Belgium
  • Average UV index in September: 4

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

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Average cloud cover in September
Hoeilaart, Belgium

Average cloud cover in September - Hoeilaart, Belgium
  • Average cloud cover in September: 43

The month with the most cloud cover is December (Cloud cover 62).
Months with the least cloud cover are April and August (Cloud cover 42).

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Average visibility in September
Hoeilaart, Belgium

Average visibility in September - Hoeilaart, Belgium
  • Average visibility in September: 9km

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

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