September weather forecast and climate
Châtillon, Belgium

Weather in September

The first month of the autumn, September, is still a comfortable month in Châtillon, Belgium, with average temperature fluctuating between 18°C (64.4°F) and 9°C (48.2°F).

Temperature

In September, the average high-temperature slightly decreases, from a pleasant 21.8°C (71.2°F) in August, to a comfortable 18°C (64.4°F). The average low-temperature, in September, is 9°C (48.2°F).

Humidity

The average relative humidity in September is 82%.

Rainfall

In Châtillon, during 12.9 rainfall days, 40mm (1.57") of precipitation is typically accumulated. In Châtillon, during the entire year, the rain falls for 179.7 days and collects up to 616mm (24.25") of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

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

Sunshine

The average sunshine in Châtillon, Belgium, is 7.9h.

UV index

The average daily maximum UV index in Châtillon, Belgium, is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 3 in September interpret into the following advice:
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 Châtillon?

The average high-temperature, in September, in Châtillon, is 18°C (64.4°F), while the average low-temperature is 9°C (48.2°F).

What is the average humidity in September in Châtillon?

The average relative humidity in September in Châtillon is 82%.

How much does it rain in Châtillon in September?

In September, in Châtillon, the rain falls for 12.9 days. Throughout September, 40mm (1.57") of precipitation is accumulated.

Does it snow in Châtillon in September?

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

When it does not snow in Châtillon?

In Châtillon, Belgium, snow does not fall in June through September.

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

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

How long on average sun shines in September in Châtillon?

In September, the average sunshine in Châtillon, Belgium, is 7.9h.

What is the UV index reading in September in Châtillon?

The average daily maximum UV index in September in Châtillon, Belgium, is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in September
Châtillon, Belgium

Average temperature in September - Châtillon, Belgium
  • Average high temperature in September: 18°C

The warmest months (with the highest average high temperature) are July and August (21.8°C).
The month with the lowest average high temperature is January (3°C).

  • Average low temperature in September: 9°C

The month with the highest average low temperature is August (12.3°C).
The coldest month (with the lowest average low temperature) is January (-1.1°C).

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Average pressure in September
Châtillon, Belgium

Average pressure in September - Châtillon, Belgium
  • Average pressure in September: 1017.9mbar

The month with the highest atmospheric pressure is December (1018.1mbar).
The month with the lowest atmospheric pressure is November (1013.9mbar).

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Average wind speed in September
Châtillon, Belgium

Average wind speed in September - Châtillon, Belgium
  • Average wind speed in September: 10.4km/h

The windiest month (with the highest average wind speed) is February (16km/h).
The calmest month (with the lowest average wind speed) is August (9.8km/h).

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Average humidity in September
Châtillon, Belgium

Average humidity in September - Châtillon, Belgium
  • Average humidity in September: 82%

The month with the highest relative humidity is December (92%).
Months with the lowest relative humidity are April and August (78%).

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Average rainfall in September
Châtillon, Belgium

Average rainfall in September - Châtillon, Belgium
  • Average rainfall in September: 40mm

The wettest month (with the highest rainfall) is December (73mm).
The driest month (with the least rainfall) is April (34mm).

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Average rainfall days in September
Châtillon, Belgium

Average rainfall days in September - Châtillon, Belgium
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is February (11.6 days).

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Average snowfall in September
Châtillon, Belgium

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

Months with the highest snowfall are January and December (80mm).
Months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in September
Châtillon, Belgium

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

The month with the highest number of snowfall days is January (9.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
Châtillon, Belgium

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

The month with the longest days is June (Average daylight: 16.2h).
The month with the shortest days is December (Average daylight: 8.2h).

  • Average sunshine in September: 7.9h

The month with the most sunshine is July (Average sunshine: 9.4h).
The month with the least sunshine is December (Average sunshine: 3h).

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Average sunshine days in September
Châtillon, Belgium

Average sunshine days in September - Châtillon, Belgium
  • Average sunshine days in September: 14.7 days

Months with the most sunshine days are April and September (14.7 days).
The month with the least sunshine days is December (9 days).

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Average UV index in September
Châtillon, Belgium

Average UV index in September - Châtillon, Belgium
  • Average UV index in September: 3

The month with the highest UV index is July (UV index 5).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in September
Châtillon, Belgium

Average cloud cover in September - Châtillon, Belgium
  • Average cloud cover in September: 42

The month with the most cloud cover is December (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 39).

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Average visibility in September
Châtillon, Belgium

Average visibility in September - Châtillon, Belgium
  • Average visibility in September: 8km

Months with the highest visibility are March, April and August (9km).
The month with the lowest visibility is November (7km).

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