Weather in September
Meteorological information (average 1981 – 2010)
Average temperature in September: 15° (11° - 19°)
Average precipitations in September: 68.9 mm
Average humidity in September: 80.9
Average numbers of hours of sun in September: 143
Average wind speed in September: 3
This report describes the typical weather at the Antwerp International Airport (Antwerp/Deurne, Belgium) weather station over the course of an average September. It is based on the historical records from 1974 to 2012. Antwerp is only 25 km away from Hazewinkel
The month of September is characterized by falling daily high temperatures, with daily highs decreasing from 21°C to 17°C over the course of the month, exceeding 25°C or dropping below 14°C only one day in ten. Daily low temperatures range from 10°C to 12°C, falling below 6°C or exceeding 16°C only one day in ten.
Over the course of September, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1:51 hours, implying an average day-over-day decrease of 3.7 minutes.
The shortest day of the month is September 30 with 11:40 hours of daylight; the longest day is September 1 with 13:31 hours of daylight.
The median cloud cover ranges from 59% (partly cloudy) to 67% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 8% from the start to the end of the month.
The average probability that some form of precipitation will be observed in a given day is 55%, with little variation over the course of the month.
The relative humidity typically ranges from 58% (mildly humid) to 96% (very humid) over the course of a typical September, rarely dropping below 45% (comfortable) and reaching as high as 100% (very humid).
The air is driest around September 1, at which time the relative humidity drops below 65% (mildly humid) three days out of four; it is most humid around September 30, rising above 93% (very humid) three days out of four.
Over the course of September typical wind speeds vary from 1 m/s to 5 m/s (light air to gentle breeze), rarely exceeding 9 m/s (fresh breeze).