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September Weather in Heemskerk, Netherlands

Last updated: August 27, 2025

In September, the average temperature in Heemskerk, Netherlands hovers around 16°C (60°F). Expect a minimum of 7°C (45°F) and a maximum of 27°C (81°F), providing a comfortable range for outdoor activities. However, be prepared for some rain, with a precipitation amount of 93 mm (3.7 in) spread over 12 days. Humidity levels are typically high, averaging around 83%, which can make the air feel quite muggy.

September Temperature in Heemskerk

In September in Heemskerk, the average temperature is 16°C (60°F). Maximum temperatures can reach 27°C (81°F), while the minimum can drop as low as 7°C (45°F). This mild climate makes Heemskerk an ideal destination for travelers seeking comfortable weather and outdoor adventures.

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

The chart illustrates September temperature patterns in Heemskerk, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heemskerk, September typically has an average temperature of 16°C (60°F), with highs reaching up to 27°C (81°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec414144485462646560554743
Data source: Temperature data for Heemskerk 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 Heemskerk

In Heemskerk in September, the precipitation amount is 93 mm (3.7 in) over the course of 12 days.

September Precipitation Trends in Heemskerk

The chart displays monthly precipitation patterns in Heemskerk, 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 Heemskerk, September typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec62717143547473999311565105
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Heemskerk

In Heemskerk in September humidity is 83%. With an average temperature of 16°C (60°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities a bit uncomfortable for traveling.

September Average Humidity in Heemskerk

This chart illustrates the average monthly humidity levels in Heemskerk, 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 Heemskerk 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 Heemskerk

In Heemskerk 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 Heemskerk.

Maximum UV Index Levels in Heemskerk for September

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

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

This table compares monthly weather conditions in Heemskerk, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)62 mm (2.4 inches)87%low
February Weather5°C (42°F)71 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 Weather12°C (55°F)54 mm (2.1 inches)84%high
June Weather17°C (62°F)74 mm (2.9 inches)81%very high
July Weather18°C (64°F)73 mm (2.9 inches)80%very high
August Weather18°C (65°F)99 mm (3.9 inches)78%high
September Weather16°C (60°F)93 mm (3.7 inches)83%moderate
October Weather13°C (55°F)115 mm (4.5 inches)86%moderate
November Weather9°C (48°F)65 mm (2.6 inches)87%low
December Weather6°C (44°F)105 mm (4.1 inches)86%low

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