September weather forecastBilthoven, Netherlands
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Bilthoven, Netherlands, with temperature in the range of an average high of 18.7°C (65.7°F) and an average low of 11.5°C (52.7°F).Temperature
In September, the meteorological conditions change slightly, with the average high-temperature moving from an agreeable 22.1°C (71.8°F) in August to a comfortable 18.7°C (65.7°F). During September, Bilthoven sees a mean low-temperature of 11.5°C (52.7°F).Humidity
The average relative humidity in September is 81%.Rainfall
In September, in Bilthoven, the rain falls for 7.9 days. Throughout September, 10mm (0.39") of precipitation is accumulated. In Bilthoven, Netherlands, during the entire year, the rain falls for 116.8 days and collects up to 163mm (6.42") of precipitation.Snowfall
In Bilthoven, snow does not fall in March through November.Daylight
In Bilthoven, Netherlands, the average length of the day in September is 12h and 39min.On the first day of the month, sunrise is at 06:51 and sunset at 20:26. On the last day of September, in Bilthoven, sunrise is at 07:39 and sunset at 19:18 CEST.
Sunshine
The average sunshine in September in Bilthoven is 7.3h.UV index
The average daily maximum UV index in September in Bilthoven is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: The UV index of 4 during September translates into the following guidance:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bilthoven, Netherlands
- Average high temperature in September: 18.7°C
The warmest months (with the highest average high temperature) are July and August (22.1°C).
The month with the lowest average high temperature is January (5.1°C).
- Average low temperature in September: 11.5°C
The month with the highest average low temperature is August (14°C).
The coldest month (with the lowest average low temperature) is February (1.4°C).
Average pressure in September
Bilthoven, Netherlands
- Average pressure in September: 1017mbar
The month with the highest atmospheric pressure is September (1017mbar).
The month with the lowest atmospheric pressure is November (1011.5mbar).
Average wind speed in September
Bilthoven, Netherlands
- Average wind speed in September: 12.3km/h
The windiest month (with the highest average wind speed) is December (17.9km/h).
The calmest month (with the lowest average wind speed) is August (11.9km/h).
Average humidity in September
Bilthoven, Netherlands
- Average humidity in September: 81%
The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Bilthoven, Netherlands
- Average rainfall in September: 10mm
The wettest months (with the highest rainfall) are June and July (19mm).
The driest month (with the least rainfall) is April (8mm).
Average rainfall days in September
Bilthoven, Netherlands
- Average rainfall days in September: 7.9 days
The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is October (7.3 days).
Average snowfall in September
Bilthoven, Netherlands
- Average snowfall in September: 0mm
The month with the highest snowfall is February (12mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Bilthoven, Netherlands
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.2 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
Bilthoven, Netherlands
- Average daylight in September: 12h and 42min
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 18min
The month with the most sunshine is July (Average sunshine: 9h and 30min).
The month with the least sunshine is December (Average sunshine: 3h and 36min).
Average sunshine days in September
Bilthoven, Netherlands
- Average sunshine days in September: 18 days
The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is June (12.7 days).
Average UV index in September
Bilthoven, 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
Bilthoven, Netherlands
- Average cloud cover in September: 45
The month with the most cloud cover is December (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 41).
Average visibility in September
Bilthoven, Netherlands
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
