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
Alphen aan den Rijn records a slight change with September's average high-temperatures adjusting to a comfortable 18.1°C (64.6°F) from August's 21°C (69.8°F). Alphen aan den Rijn marks an average drop to a moderate 13.8°C (56.8°F) during nighttime in September, following the high of the day.Humidity
In Alphen aan den Rijn, the average relative humidity in September is 77%.Rainfall
In Alphen aan den Rijn, in September, it is raining for 15.6 days, with typically 40mm (1.57") of accumulated precipitation. In Alphen aan den Rijn, during the entire year, the rain falls for 183.4 days and collects up to 400mm (15.75") of precipitation.Snowfall
In Alphen aan den Rijn, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 39min.On the first day of the month, sunrise is at 06:53 and sunset at 20:28. On the last day of September, sunrise is at 07:41 and sunset at 19:20 CEST.
Sunshine
The average sunshine in September in Alphen aan den Rijn is 7.1h.UV index
In Alphen aan den Rijn, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Stay sun-safe with clothing that is both closely woven and worn loosely.
Frequently asked questions
What are the temperatures in Alphen aan den Rijn in September?
What is the average humidity in September in Alphen aan den Rijn?
How much does it rain in Alphen aan den Rijn in September?
When it does not snow in Alphen aan den Rijn?
What is the average length of the day in September in Alphen aan den Rijn?
When are sunrise and sunset in September in Alphen aan den Rijn?
How many hours of sunshine does Alphen aan den Rijn have in September?
What is the UV index intensity in September in Alphen aan den Rijn?
Average temperature in September
Alphen aan den Rijn, Netherlands
- Average high temperature in September: 18.1°C
The warmest month (with the highest average high temperature) is August (21°C).
The month with the lowest average high temperature is January (5.8°C).
- Average low temperature in September: 13.8°C
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (2.8°C).
Average pressure in September
Alphen aan den Rijn, Netherlands
- Average pressure in September: 1016.8mbar
The month with the highest atmospheric pressure is September (1016.8mbar).
The month with the lowest atmospheric pressure is November (1011.2mbar).
Average wind speed in September
Alphen aan den Rijn, Netherlands
- Average wind speed in September: 17.5km/h
The windiest month (with the highest average wind speed) is December (24.7km/h).
The calmest month (with the lowest average wind speed) is July (16.1km/h).
Average humidity in September
Alphen aan den Rijn, Netherlands
- Average humidity in September: 77%
The months with the highest relative humidity are January and December (83%).
The months with the lowest relative humidity are April and August (75%).
Average rainfall in September
Alphen aan den Rijn, Netherlands
- Average rainfall in September: 40mm
The wettest month (with the highest rainfall) is August (53mm).
The driest month (with the least rainfall) is April (14mm).
Average rainfall days in September
Alphen aan den Rijn, Netherlands
- Average rainfall days in September: 15.6 days
The month with the highest number of rainy days is August (19.1 days).
The month with the least rainy days is April (11.3 days).
Average snowfall in September
Alphen aan den Rijn, Netherlands
- Average snowfall in September: 0mm
The month with the highest snowfall is February (22mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Alphen aan den Rijn, Netherlands
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.8 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
Alphen aan den Rijn, Netherlands
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 42min).
The month with the shortest days is December (Average daylight: 7h and 48min).
- Average sunshine in September: 7h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 30min).
Average sunshine days in September
Alphen aan den Rijn, Netherlands
- Average sunshine days in September: 10.8 days
The month with the most sunshine days is April (16.8 days).
The month with the least sunshine days is December (8.1 days).
Average UV index in September
Alphen aan den Rijn, Netherlands
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Alphen aan den Rijn, Netherlands
- Average cloud cover in September: 44
The month with the most cloud cover is December (Cloud cover 65).
The months with the least cloud cover are April and August (Cloud cover 38).
Average visibility in September
Alphen aan den Rijn, Netherlands
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (10km).
The months with the lowest visibility are January and December (9km).
Alphen aan den Rijn, Netherlands
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