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September Weather in Kasterlee, Belgium

Last updated: August 22, 2025

In Kasterlee, Belgium, the average temperature in September hovers around 15°C (60°F). Expect a range between a brisk 3°C (38°F) and a warm 33°C (92°F). With an average precipitation of 58 mm (2.3 in) spread over 10 days, and humidity levels at a notable 82%, this month brings a blend of cool breezes and occasional showers.

September Temperature in Kasterlee

In September in Kasterlee, the average temperature is 15°C (60°F). The maximum can reach 33°C (92°F), and the minimum can be as low as 3°C (38°F). This diverse temperature range makes it advisable for travelers to pack layers to stay comfortable throughout the day.

September Weather in Kasterlee: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Kasterlee, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Kasterlee, September typically has an average temperature of 15°C (60°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec394145505765666660544542
Data source: Temperature data for Kasterlee 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 Kasterlee

In Kasterlee in September, the total precipitation amount is 58 mm (2.3 in), measured over a span of 10 days.

September Precipitation Trends in Kasterlee

The chart displays monthly precipitation patterns in Kasterlee, 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 Kasterlee, September typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec657475386869818158875795
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Kasterlee

In Kasterlee in September humidity is 82%. With an average temperature of 15°C (60°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and draining, which can hinder your travel experience.

September Average Humidity in Kasterlee

This chart illustrates the average monthly humidity levels in Kasterlee, 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 Kasterlee is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%87%85%82%82%80%76%82%89%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Kasterlee

In Kasterlee 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 Kasterlee.

Maximum UV Index Levels in Kasterlee for September

The chart shows the monthly maximum UV Index (UVI) for Kasterlee 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 Kasterlee typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875321
Data source: Kasterlee 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 Kasterlee Compares to Other Months

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

This table compares monthly weather conditions in Kasterlee, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)65 mm (2.5 inches)91%low
February Weather5°C (42°F)74 mm (2.9 inches)89%low
March Weather7°C (45°F)75 mm (3.0 inches)87%moderate
April Weather10°C (51°F)37 mm (1.5 inches)85%moderate
May Weather14°C (57°F)68 mm (2.7 inches)82%high
June Weather19°C (66°F)69 mm (2.7 inches)82%very high
July Weather19°C (67°F)81 mm (3.2 inches)80%very high
August Weather19°C (66°F)81 mm (3.2 inches)76%high
September Weather15°C (60°F)58 mm (2.3 inches)82%moderate
October Weather12°C (54°F)87 mm (3.4 inches)89%moderate
November Weather7°C (45°F)57 mm (2.3 inches)92%low
December Weather5°C (42°F)95 mm (3.7 inches)92%low

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