September weather forecastKatwijk, Netherlands
September
Weather in September
The first month of the autumn, September, is still a comfortable month in Katwijk, Netherlands, with an average temperature fluctuating between 18.8°C (65.8°F) and 10.7°C (51.3°F).Temperature
Katwijk in September undergoes a slight reduction in the average high-temperature, shifting from August's pleasant 22.5°C (72.5°F) to an enjoyable 18.8°C (65.8°F). In Katwijk, September is marked by an average low-temperature of 10.7°C (51.3°F).Humidity
In September, the average relative humidity is 82%.Rainfall
In September, the rain falls for 14.7 days. Throughout September, 28mm (1.1") of precipitation is accumulated. Throughout the year, there are 174.3 rainfall days, and 415mm (16.34") of precipitation is accumulated.Snowfall
In Katwijk, Netherlands, snow does not fall in April through October.Daylight
In September, the average length of the day in Katwijk is 12h and 38min.On the first day of the month, sunrise is at 06:49 and sunset at 20:23. On the last day of September, in Katwijk, sunrise is at 07:36 and sunset at 19:16 CEST.
Sunshine
In September, the average sunshine in Katwijk is 7.6h.UV index
In Katwijk, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The average daily UV index of 4 in September transforms into the following instructions:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Katwijk, Netherlands
- Average high temperature in September: 18.8°C
The warmest month (with the highest average high temperature) is July (22.6°C).
The month with the lowest average high temperature is January (4.7°C).
- Average low temperature in September: 10.7°C
The month with the highest average low temperature is August (13.9°C).
The coldest month (with the lowest average low temperature) is January (1°C).
Average pressure in September
Katwijk, Netherlands
- Average pressure in September: 1017.2mbar
The month with the highest atmospheric pressure is September (1017.2mbar).
The month with the lowest atmospheric pressure is November (1012.1mbar).
Average wind speed in September
Katwijk, Netherlands
- Average wind speed in September: 11.7km/h
The windiest month (with the highest average wind speed) is December (17.6km/h).
The calmest month (with the lowest average wind speed) is August (11.5km/h).
Average humidity in September
Katwijk, Netherlands
- Average humidity in September: 82%
The month with the highest relative humidity is December (89%).
The month with the lowest relative humidity is April (74%).
Average rainfall in September
Katwijk, Netherlands
- Average rainfall in September: 28mm
The wettest month (with the highest rainfall) is July (51mm).
The driest month (with the least rainfall) is April (19mm).
Average rainfall days in September
Katwijk, Netherlands
- Average rainfall days in September: 14.7 days
The month with the highest number of rainy days is July (19.3 days).
The month with the least rainy days is November (11.6 days).
Average snowfall in September
Katwijk, Netherlands
- Average snowfall in September: 0mm
The month with the highest snowfall is January (26mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Katwijk, Netherlands
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and February (3.3 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
Katwijk, Netherlands
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 36min).
The month with the shortest days is December (Average daylight: 7h and 54min).
- Average sunshine in September: 7h and 36min
The month with the most sunshine is July (Average sunshine: 9h and 6min).
The month with the least sunshine is December (Average sunshine: 3h and 42min).
Average sunshine days in September
Katwijk, Netherlands
- Average sunshine days in September: 12.7 days
The month with the most sunshine days is April (16.3 days).
The month with the least sunshine days is July (9.2 days).
Average UV index in September
Katwijk, 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
Katwijk, 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
Katwijk, Netherlands
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, May, June, July, August, October, November and December (9km).
The month with the lowest visibility is September (8km).
