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September Weather in Ayer, Switzerland

Last updated: August 27, 2025

In September, the average temperature in Ayer, Switzerland hovers around 9°C (49°F), with temperatures ranging from a brisk -5°C (23°F) to a warm 22°C (72°F). Expect a precipitation total of 90 mm (3.6 in) spread over about 12 days, contributing to an average humidity level of 81%. Prepare for both chilly and mild days!

September Temperature in Ayer

In September in Ayer, the average temperature is 9°C (49°F). Maximum temperatures can reach 22°C (72°F), while the minimum can drop to as low as -5°C (23°F). This variation makes Ayer a destination where travelers should be prepared for both mild days and chilly nights.

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

The chart illustrates September temperature patterns in Ayer, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ayer, September typically has an average temperature of 9°C (49°F), with highs reaching up to 22°C (72°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec162329374353565649412918
Data source: Temperature data for Ayer 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 Ayer

In Ayer in September, the precipitation amount is 90 mm (3.6 in) spread over 12 days.

September Precipitation Trends in Ayer

The chart displays monthly precipitation patterns in Ayer, 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 Ayer, September typically receives around 90 mm (3.6 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec13596122811601301211299013598188
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ayer

In Ayer in September humidity is 81%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill clinging to your skin, making outdoor explorations rather uncomfortable and potentially dreary for travelers.

September Average Humidity in Ayer

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

In Ayer 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 Ayer.

Maximum UV Index Levels in Ayer for September

The chart shows the monthly maximum UV Index (UVI) for Ayer 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 Ayer typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec347810111097632
Data source: Ayer 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 Ayer Compares to Other Months

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

This table compares monthly weather conditions in Ayer, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)135 mm (5.3 inches)91%moderate
February Weather-5°C (23°F)95 mm (3.8 inches)89%moderate
March Weather-2°C (29°F)122 mm (4.8 inches)87%high
April Weather3°C (37°F)81 mm (3.2 inches)84%very high
May Weather6°C (43°F)160 mm (6.3 inches)80%very high
June Weather12°C (53°F)130 mm (5.1 inches)82%extreme
July Weather14°C (57°F)121 mm (4.8 inches)82%very high
August Weather13°C (56°F)129 mm (5.1 inches)77%very high
September Weather9°C (49°F)90 mm (3.6 inches)81%high
October Weather5°C (41°F)135 mm (5.3 inches)89%high
November Weather-2°C (29°F)98 mm (3.8 inches)89%moderate
December Weather-8°C (18°F)188 mm (7.4 inches)91%low

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