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September Weather in Giswil, Switzerland

Last updated: August 27, 2025

In Giswil, Switzerland, the average temperature in September hovers around 9°C (48°F), with a minimum dropping to -6°C (22°F) and a maximum reaching 21°C (69°F). Expect about 161 mm (6.4 in) of precipitation over 15 days, contributing to a notably high average humidity of 83%.

September Temperature in Giswil

In September in Giswil, the average temperature is 9°C (48°F), with maximums reaching up to 21°C (69°F) and minimums dropping as low as -6°C (22°F). It's advisable to pack layers to accommodate the variable weather while traveling during this time.

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

The chart illustrates September temperature patterns in Giswil, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Giswil, September typically has an average temperature of 9°C (48°F), with highs reaching up to 21°C (69°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec212529354252555448413124
Data source: Temperature data for Giswil 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 Giswil

In Giswil in September, the total precipitation amount is 161 mm (6.4 in) spread over 15 days.

September Precipitation Trends in Giswil

The chart displays monthly precipitation patterns in Giswil, 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 Giswil, September typically receives around 161 mm (6.4 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec140104132101169225244255161177109188
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Giswil

In Giswil in September humidity is 83%. With an average temperature of 9°C (48°F), this humidity feels like an enveloping blanket, making outdoor activities quite uncomfortable and encouraging travelers to seek shelter or shade frequently.

September Average Humidity in Giswil

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

In Giswil in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Giswil.

Maximum UV Index Levels in Giswil for September

The chart shows the monthly maximum UV Index (UVI) for Giswil 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 Giswil typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24689101097532
Data source: Giswil 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 Giswil Compares to Other Months

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

This table compares monthly weather conditions in Giswil, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)140 mm (5.5 inches)92%low
February Weather-4°C (25°F)104 mm (4.1 inches)89%moderate
March Weather-2°C (29°F)132 mm (5.2 inches)87%high
April Weather2°C (35°F)101 mm (4.0 inches)84%very high
May Weather6°C (42°F)169 mm (6.7 inches)80%very high
June Weather11°C (52°F)225 mm (8.9 inches)82%very high
July Weather13°C (55°F)244 mm (9.6 inches)83%very high
August Weather12°C (55°F)255 mm (10.0 inches)80%very high
September Weather9°C (48°F)161 mm (6.4 inches)83%high
October Weather5°C (41°F)177 mm (7.0 inches)90%moderate
November Weather-1°C (31°F)109 mm (4.3 inches)88%moderate
December Weather-5°C (24°F)188 mm (7.4 inches)90%low

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