September weather forecastChâtillon, Belgium
September
Weather in September
September marks the beginning of autumn in Châtillon, with a decrease in temperatures to an average high of 18°C (64.4°F). Despite this shift, these conditions are quite welcoming for outdoor activities. The spectacular fall foliage makes up for the slightly cooler temperatures, painting the city in hues of yellows and reds. The overall weather remains pleasant with a significant drop in rainfall to around 40mm (1.57"). Despite the shortening daylight hours, the city continues to flourish under the mellow autumn sun.Temperature
The arrival of September suggests a slight decrease in the average high-temperature, moving from an agreeable 21.8°C (71.2°F) in August to a refreshing 18°C (64.4°F). Châtillon's temperature in September lowers to a consistent average of 9°C (48.2°F) during the nights.Humidity
In September, the average relative humidity is 82%.Rainfall
In Châtillon, in September, it is raining for 12.9 days, with typically 40mm (1.57") of accumulated precipitation. Throughout the year, there are 179.7 rainfall days, and 616mm (24.25") of precipitation is accumulated.Snowfall
In Châtillon, snow does not fall in June through September.Daylight
In Châtillon, Belgium, the average length of the day in September is 12h and 36min.On the first day of September, sunrise is at 06:53 and sunset at 20:20. On the last day of the month, sunrise is at 07:36 and sunset at 19:17 CEST.
Sunshine
In Châtillon, Belgium, the average sunshine in September is 7.9h.UV index
In Châtillon, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In September, an average UV index of 3 transforms into the following instructions:
Adopt protective measures - Suggestions to resist sunburn are offered. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
Average humidity in September
Châtillon, Belgium
- Average humidity in September: 82%
The month with the highest relative humidity is December (92%).
The months with the lowest relative humidity are April and August (78%).
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).
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).
Average snowfall in September
Châtillon, Belgium
- Average snowfall in September: 0mm
The months with the highest snowfall are January and December (80mm).
The months with the least snowfall are June, July, August and September (0mm).
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).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Châtillon, Belgium
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 12min).
- Average sunshine in September: 7h and 54min
The month with the most sunshine is July (Average sunshine: 9h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 0min).
Average sunshine days in September
Châtillon, Belgium
- Average sunshine days in September: 14.7 days
The months with the most sunshine days are April and September (14.7 days).
The month with the least sunshine days is December (9 days).
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).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
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).
Average visibility in September
Châtillon, Belgium
- Average visibility in September: 8km
The months with the highest visibility are March, April and August (9km).
The month with the lowest visibility is November (7km).
