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September Weather in Katwijk aan den Rijn, Netherlands

Last updated: August 27, 2025

The average temperature in Katwijk aan den Rijn, Netherlands during September is 16°C (61°F), with a minimum of 8°C (46°F) and a maximum of 27°C (81°F). Expect around 96 mm (3.8 in) of precipitation spread over 13 days, resulting in an average humidity of 83%.

September Temperature in Katwijk aan den Rijn

In September in Katwijk aan den Rijn, the average temperature is 16°C (61°F), with maximums reaching up to 27°C (81°F) and minimums dropping as low as 8°C (46°F). This mild climate makes Katwijk aan den Rijn an ideal destination for travelers looking to enjoy pleasant weather during their visit.

September Weather in Katwijk aan den Rijn: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Katwijk aan den Rijn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Katwijk aan den Rijn, September typically has an average temperature of 16°C (61°F), with highs reaching up to 27°C (81°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec414144485562646560554844
Data source: Temperature data for Katwijk aan den Rijn generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Katwijk aan den Rijn

In Katwijk aan den Rijn in September, the precipitation amount is 96 mm (3.8 in) spread over 13 days, indicating a relatively rainy period.

September Precipitation Trends in Katwijk aan den Rijn

The chart displays monthly precipitation patterns in Katwijk aan den Rijn, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Katwijk aan den Rijn, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec66727143587068959612070110
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Katwijk aan den Rijn

In Katwijk aan den Rijn in September, humidity is 83%. With an average temperature of 16°C (61°F), this humidity feels like a warm, muggy blanket wrapping around you, making travel a bit sticky and potentially uncomfortable as you navigate through the sights.

September Average Humidity in Katwijk aan den Rijn

This chart illustrates the average monthly humidity levels in Katwijk aan den Rijn, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Katwijk aan den Rijn is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%85%84%82%80%78%83%86%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Katwijk aan den Rijn

In Katwijk aan den Rijn in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Katwijk aan den Rijn.

Maximum UV Index Levels in Katwijk aan den Rijn for September

The chart shows the monthly maximum UV Index (UVI) for Katwijk aan den Rijn in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Katwijk aan den Rijn typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Katwijk aan den Rijn September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Katwijk aan den Rijn Compares to Other Months

Weather in Katwijk aan den Rijn varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Katwijk aan den Rijn, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Katwijk aan den Rijn, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)66 mm (2.6 inches)87%low
February Weather5°C (42°F)72 mm (2.8 inches)87%low
March Weather7°C (44°F)71 mm (2.8 inches)86%moderate
April Weather9°C (49°F)43 mm (1.7 inches)85%moderate
May Weather13°C (55°F)58 mm (2.3 inches)84%high
June Weather17°C (62°F)70 mm (2.8 inches)81%very high
July Weather18°C (65°F)68 mm (2.7 inches)80%very high
August Weather19°C (66°F)95 mm (3.7 inches)78%high
September Weather16°C (61°F)96 mm (3.8 inches)83%moderate
October Weather13°C (56°F)120 mm (4.7 inches)86%moderate
November Weather9°C (48°F)70 mm (2.8 inches)87%low
December Weather6°C (44°F)110 mm (4.3 inches)86%low

Compare Katwijk aan den Rijn's Climate with Cities Worldwide