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September Weather in Pieterlen, Switzerland

Last updated: August 27, 2025

In September, the average temperature in Pieterlen, Switzerland hovers around 15°C (59°F). Expect a range, with minimums dipping to 1°C (34°F) and maximums reaching up to 29°C (84°F). With 82 mm (3.2 in) of precipitation spread over 12 days, it's wise to prepare for some rain. The average humidity is quite high at 81%, adding to the overall ambiance of the season.

September Temperature in Pieterlen

In September in Pieterlen, the average temperature is 15°C (59°F). Maximums can reach 29°C (84°F), while minimums can dip as low as 1°C (34°F). This varied climate makes it an excellent time for travelers to enjoy a mix of warm days and cool evenings.

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

The chart illustrates September temperature patterns in Pieterlen, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pieterlen, September typically has an average temperature of 15°C (59°F), with highs reaching up to 29°C (84°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec333742485564666658504036
Data source: Temperature data for Pieterlen 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 Pieterlen

In Pieterlen in September, the precipitation amount is 82 mm (3.2 in) occurring over a span of 12 days.

September Precipitation Trends in Pieterlen

The chart displays monthly precipitation patterns in Pieterlen, 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 Pieterlen, September typically receives around 82 mm (3.2 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec9884100671561411501528210484138
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Pieterlen

In Pieterlen in September humidity is 81%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket draped over you, making traveling quite uncomfortable as you constantly wipe away beads of sweat and feel the stickiness clinging to your clothes.

September Average Humidity in Pieterlen

This chart illustrates the average monthly humidity levels in Pieterlen, 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 Pieterlen is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%87%84%80%82%82%77%81%89%89%91%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Pieterlen

In Pieterlen in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Pieterlen, you can refer to this Hourly UV Index in Pieterlen.

Maximum UV Index Levels in Pieterlen for September

The chart shows the monthly maximum UV Index (UVI) for Pieterlen 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 Pieterlen typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986422
Data source: Pieterlen 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 Pieterlen Compares to Other Months

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

This table compares monthly weather conditions in Pieterlen, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (33°F)98 mm (3.9 inches)91%low
February Weather3°C (38°F)84 mm (3.3 inches)89%moderate
March Weather5°C (42°F)100 mm (3.9 inches)87%moderate
April Weather9°C (49°F)67 mm (2.6 inches)84%high
May Weather13°C (55°F)156 mm (6.1 inches)80%very high
June Weather18°C (64°F)141 mm (5.6 inches)82%very high
July Weather19°C (67°F)150 mm (5.9 inches)82%very high
August Weather19°C (66°F)152 mm (6.0 inches)77%very high
September Weather15°C (59°F)82 mm (3.2 inches)81%high
October Weather10°C (50°F)104 mm (4.1 inches)89%moderate
November Weather4°C (40°F)84 mm (3.3 inches)89%low
December Weather2°C (36°F)138 mm (5.4 inches)91%low

Compare Pieterlen's Climate with Cities Worldwide