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September Weather in Saint-Imier, Switzerland

Last updated: August 27, 2025

In Saint-Imier, Switzerland, the average temperature in September hovers around 14°C (58°F). You can expect temperatures to range from a chilly 2°C (35°F) at the lowest to a pleasant 28°C (83°F) at the highest. Be prepared for some rain, as 91 mm (3.6 in) of precipitation typically falls over 12 days. With an average humidity of 81%, it’s a month that combines mild temperatures with a touch of dampness.

September Temperature in Saint-Imier

In September in Saint-Imier, the average temperature is 14°C (58°F). Maximums can reach 28°C (83°F) while minimums can drop to as low as 2°C (35°F). This makes it an ideal time for travelers who appreciate mild weather and are prepared for varying temperatures.

September Weather in Saint-Imier: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Saint-Imier, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint-Imier, September typically has an average temperature of 14°C (58°F), with highs reaching up to 28°C (83°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec323641485463656457494036
Data source: Temperature data for Saint-Imier 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 Saint-Imier

In Saint-Imier in September, the precipitation amount is 91 mm (3.6 in) over a period of 12 days.

September Precipitation Trends in Saint-Imier

The chart displays monthly precipitation patterns in Saint-Imier, 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 Saint-Imier, September typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec11292114731721641581579111294159
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saint-Imier

In Saint-Imier in September, humidity is 81%. With an average temperature of 14°C (58°F), this humidity feels like a warm blanket wrapping around you, making outdoor adventures sticky and challenging, while also providing a lush, vibrant atmosphere perfect for exploring.

September Average Humidity in Saint-Imier

This chart illustrates the average monthly humidity levels in Saint-Imier, 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 Saint-Imier 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 Saint-Imier

In Saint-Imier 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 Saint-Imier, you can refer to this Hourly UV Index in Saint-Imier.

Maximum UV Index Levels in Saint-Imier for September

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

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

This table compares monthly weather conditions in Saint-Imier, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)112 mm (4.4 inches)91%low
February Weather2°C (37°F)92 mm (3.6 inches)89%moderate
March Weather5°C (41°F)114 mm (4.5 inches)87%moderate
April Weather9°C (48°F)73 mm (2.9 inches)84%high
May Weather12°C (54°F)172 mm (6.8 inches)80%very high
June Weather17°C (63°F)164 mm (6.5 inches)82%very high
July Weather18°C (65°F)158 mm (6.2 inches)82%very high
August Weather18°C (65°F)157 mm (6.2 inches)77%very high
September Weather14°C (58°F)91 mm (3.6 inches)81%high
October Weather10°C (49°F)112 mm (4.4 inches)89%moderate
November Weather4°C (40°F)94 mm (3.7 inches)89%low
December Weather2°C (36°F)159 mm (6.2 inches)91%low

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