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September Weather in Grafstal, Switzerland

Last updated: August 27, 2025

In September, the average temperature in Grafstal, Switzerland hovers around 15°C (59°F), with a minimum of 3°C (38°F) and a maximum of 29°C (84°F). Expect some rain, as precipitation averages 84 mm (3.3 in) over 11 days, leading to a rather humid atmosphere with an average humidity of 83%.

September Temperature in Grafstal

In September in Grafstal, the average temperature is 15°C (59°F). The maximum can reach 29°C (84°F), while the minimum can drop as low as 3°C (38°F). This makes it a great time to explore Grafstal, as you can enjoy mild weather with a mix of pleasant warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Grafstal, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grafstal, 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 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec343842495665676759514137
Data source: Temperature data for Grafstal 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 Grafstal

In Grafstal, in September, the precipitation amount is 84 mm (3.3 in) during a period of 11 days.

September Precipitation Trends in Grafstal

The chart displays monthly precipitation patterns in Grafstal, 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 Grafstal, September typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9875866312313892114849462121
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Grafstal

In Grafstal in September humidity is 83%. With an average temperature of 15°C (59°F), this humidity feels like a cozy, damp embrace that can be quite stifling for traveling, making even short walks feel more exhausting than they should, and prompting a need for frequent breaks in shaded or air-conditioned areas.

September Average Humidity in Grafstal

This chart illustrates the average monthly humidity levels in Grafstal, 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 Grafstal is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%89%87%84%80%82%83%80%83%90%89%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Grafstal

In Grafstal 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 Grafstal, you can refer to this Hourly UV Index in Grafstal.

Maximum UV Index Levels in Grafstal for September

The chart shows the monthly maximum UV Index (UVI) for Grafstal 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 Grafstal typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689986421
Data source: Grafstal 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 Grafstal Compares to Other Months

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

This table compares monthly weather conditions in Grafstal, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)97 mm (3.8 inches)92%low
February Weather3°C (38°F)75 mm (3.0 inches)89%moderate
March Weather6°C (43°F)86 mm (3.4 inches)87%moderate
April Weather10°C (50°F)63 mm (2.5 inches)84%high
May Weather13°C (56°F)123 mm (4.9 inches)80%very high
June Weather18°C (65°F)138 mm (5.4 inches)82%very high
July Weather20°C (68°F)92 mm (3.6 inches)83%very high
August Weather19°C (67°F)114 mm (4.5 inches)80%very high
September Weather15°C (59°F)84 mm (3.3 inches)83%high
October Weather10°C (51°F)94 mm (3.7 inches)90%moderate
November Weather5°C (41°F)62 mm (2.5 inches)88%low
December Weather3°C (37°F)121 mm (4.8 inches)90%low

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