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
September
Weather in September
Temperature
September is marked by an average high-temperature of an enjoyable 18.1°C (64.6°F), almost identical to the preceding month. Wassenaar's nighttime temperatures in September display a slight drop from daytime highs, averaging to a mild 13.8°C (56.8°F).Humidity
In Wassenaar, Netherlands, the average relative humidity in September is 77%.Rainfall
In Wassenaar, in September, it is raining for 15.6 days, with typically 40mm (1.57") of accumulated precipitation. Throughout the year, in Wassenaar, there are 183.4 rainfall days, and 400mm (15.75") of precipitation is accumulated.Snowfall
In Wassenaar, snow does not fall in April through October.Daylight
In September, the average length of the day in Wassenaar, Netherlands, is 12h and 39min.On the first day of the month, sunrise is at 06:54 and sunset at 20:29. On the last day of September, in Wassenaar, sunrise is at 07:42 and sunset at 19:21 CEST.
Sunshine
The average sunshine in September in Wassenaar is 7.1h.UV index
The average daily maximum UV index in September in Wassenaar, Netherlands, is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Exercise prevention - Precautions against solar damage are endorsed. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Wassenaar?
What is the average humidity in September in Wassenaar?
How many days does it rain in September in Wassenaar?
When it does not snow in Wassenaar?
How many hours of daylight does Wassenaar have in September?
What time are sunrise and sunset in September in Wassenaar?
How many hours of sunshine does Wassenaar have in September?
How high is the UV index in September in Wassenaar?
Average temperature in September
Wassenaar, 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
Wassenaar, 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
Wassenaar, 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
Wassenaar, 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
Wassenaar, 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
Wassenaar, 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
Wassenaar, 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
Wassenaar, 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
Wassenaar, 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
Wassenaar, 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
Wassenaar, 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
Wassenaar, 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
Wassenaar, 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).
