Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The beginning of September brings a minor change in the average high-temperature, shifting from a pleasant 22.3°C (72.1°F) in August to a refreshing 18.8°C (65.8°F). The mean low-temperature during September nights in Sart-Tilman is a chilly 9.8°C (49.6°F).Humidity
The average relative humidity in September in Sart-Tilman is 80%.Rainfall
In Sart-Tilman, in September, it is raining for 13.5 days, with typically 35mm (1.38") of accumulated precipitation. Throughout the year, there are 193.2 rainfall days, and 544mm (21.42") of precipitation is accumulated.Snowfall
In Sart-Tilman, snow does not fall in May through October.Daylight
In Sart-Tilman, the average length of the day in September is 12h and 37min.On the first day of the month, sunrise is at 06:52 and sunset at 20:22. On the last day of September, sunrise is at 07:37 and sunset at 19:17 CEST.
Sunshine
The average sunshine in September is 7.8h.UV index
The average daily maximum UV index in September in Sart-Tilman is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: The UV index of 4 during September leads to these advisories:
Act with care - The need to guard against sun damage is communicated. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Frequently asked questions
What is the temperature in September in Sart-Tilman?
What is the average humidity in September in Sart-Tilman?
How much does it rain in Sart-Tilman in September?
When it does not snow in Sart-Tilman?
What is the average length of the day in September in Sart-Tilman?
When are sunrise and sunset in September in Sart-Tilman?
How long on average sun shines in September in Sart-Tilman?
What is the UV index intensity in September in Sart-Tilman?
Average temperature in September
Sart-Tilman, Belgium
- Average high temperature in September: 18.8°C
The warmest months (with the highest average high temperature) are July and August (22.3°C).
The month with the lowest average high temperature is January (4.1°C).
- Average low temperature in September: 9.8°C
The month with the highest average low temperature is August (12.8°C).
The coldest month (with the lowest average low temperature) is January (-0.3°C).
Average pressure in September
Sart-Tilman, Belgium
- Average pressure in September: 1017.5mbar
The month with the highest atmospheric pressure is September (1017.5mbar).
The month with the lowest atmospheric pressure is November (1013.1mbar).
Average wind speed in September
Sart-Tilman, Belgium
- Average wind speed in September: 10.9km/h
The windiest month (with the highest average wind speed) is December (17km/h).
The calmest month (with the lowest average wind speed) is August (10.5km/h).
Average humidity in September
Sart-Tilman, Belgium
- Average humidity in September: 80%
The month with the highest relative humidity is December (89%).
The months with the lowest relative humidity are April and August (77%).
Average rainfall in September
Sart-Tilman, Belgium
- Average rainfall in September: 35mm
The wettest month (with the highest rainfall) is December (58mm).
The driest month (with the least rainfall) is April (26mm).
Average rainfall days in September
Sart-Tilman, Belgium
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is July (19.4 days).
The month with the least rainy days is February (12.7 days).
Average snowfall in September
Sart-Tilman, Belgium
- Average snowfall in September: 0mm
The month with the highest snowfall is January (50mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Sart-Tilman, Belgium
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Sart-Tilman, Belgium
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 6min).
- Average sunshine in September: 7h and 5min
The months with the most sunshine are July and August (Average sunshine: 9h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 36min).
Average sunshine days in September
Sart-Tilman, Belgium
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is October (14.7 days).
The month with the least sunshine days is June (8.3 days).
Average UV index in September
Sart-Tilman, Belgium
- Average UV index in September: 4
The months with the highest UV index are June and 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
Sart-Tilman, Belgium
- Average cloud cover in September: 42
The month with the most cloud cover is December (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility in September
Sart-Tilman, Belgium
- Average visibility in September: 8km
The months with the highest visibility are March, April, May, June, July and August (9km).
The months with the lowest visibility are January, February, September, October, November and December (8km).
Sart-Tilman, Belgium
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